【黑马Android】(05)短信/查询和添加/内容观察者使用/子线程网络图片查看器和Handler消息处理器/html查看器/使用HttpURLConnection采用Post方式请求数据/开源项目

备份短信和添加短信

操作系统短信的uri:　content://sms/

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.backupsms"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_SMS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.backupsms.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="backupSms"
        android:text="备份短信" />

</RelativeLayout>

package com.itheima28.backupsms.entities;

public class SmsInfo {

	private int id;
	private String address;
	private long date;
	private int type;
	private String body;
	public SmsInfo(int id, String address, long date, int type, String body) {
		super();
		this.id = id;
		this.address = address;
		this.date = date;
		this.type = type;
		this.body = body;
	}
	@Override
	public String toString() {
		return "SmsInfo [id=" + id + ", address=" + address + ", date=" + date
				+ ", type=" + type + ", body=" + body + "]";
	}
	public SmsInfo() {
		super();
		// TODO Auto-generated constructor stub
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public long getDate() {
		return date;
	}
	public void setDate(long date) {
		this.date = date;
	}
	public int getType() {
		return type;
	}
	public void setType(int type) {
		this.type = type;
	}
	public String getBody() {
		return body;
	}
	public void setBody(String body) {
		this.body = body;
	}
}

package com.itheima28.backupsms;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlSerializer;

import com.itheima28.backupsms.entities.SmsInfo;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.util.Xml;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
	}

	/**
	 * 备份短信
	 * @param v
	 */
	public void backupSms(View v) {
		// 1. 查出所有的短信
		Uri uri = Uri.parse("content://sms/");
		
		ContentResolver resolver = getContentResolver();
		Cursor cursor = resolver.query(uri, new String[]{"_id", "address", "date", "type", "body"}, null, null, null);
		
		if(cursor != null && cursor.getCount() > 0) {
			List<SmsInfo> smsList = new ArrayList<SmsInfo>();
			SmsInfo sms;
			
			while(cursor.moveToNext()) {	// 控制游标结果集的指针向下移一位, 当到最后一位, 停止.返回false
				sms = new SmsInfo();
				sms.setId(cursor.getInt(0));	// 设置短信的id
				sms.setAddress(cursor.getString(1));	// 设置短信的号码
				sms.setDate(cursor.getLong(2));	// 设置短信的日期
				sms.setType(cursor.getInt(3));	// 设置短信的类型, 接收1还是发送2
				sms.setBody(cursor.getString(4)); // 设置短信的内容
				smsList.add(sms);
			}
			cursor.close();
			
			// 2. 序列化到本地
			writeToLocal(smsList);
		}
	}
	
	/**
	 * 序列化到本地
	 */
	private void writeToLocal(List<SmsInfo> smsList) {
		
		try {
			XmlSerializer serializer = Xml.newSerializer();	// 得到序列化对象
			// 指定输出位置
			FileOutputStream fos = new FileOutputStream("/mnt/sdcard/sms.xml");
			serializer.setOutput(fos, "utf-8");
			
			serializer.startDocument("utf-8", true);
			
			serializer.startTag(null, "smss");
			
			for (SmsInfo smsInfo : smsList) {
				serializer.startTag(null, "sms");
				serializer.attribute(null, "id", String.valueOf(smsInfo.getId()));
				
				// 写号码
				serializer.startTag(null, "address");
				serializer.text(smsInfo.getAddress());
				serializer.endTag(null, "address");

				// 写时间
				serializer.startTag(null, "date");
				serializer.text(String.valueOf(smsInfo.getDate()));
				serializer.endTag(null, "date");
				
				//写类型
				serializer.startTag(null, "type");
				serializer.text(String.valueOf(smsInfo.getType()));
				serializer.endTag(null, "type");
				
				// 写内容
				serializer.startTag(null, "body");
				serializer.text(smsInfo.getBody());
				serializer.endTag(null, "body");
				
				serializer.endTag(null, "sms");
			}
			
			serializer.endTag(null, "smss");
			
			serializer.endDocument();
			
			Toast.makeText(this, "备份成功", 0).show();
		} catch (Exception e) {
			Toast.makeText(this, "备份失败", 0).show();
			e.printStackTrace();
		}
		
	}
}

相亲神器

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.xiangqin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.WRITE_SMS"/>
    <uses-permission android:name="android.permission.READ_SMS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.xiangqin.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.itheima28.xiangqin;

import android.net.Uri;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.content.ContentValues;
import android.view.Menu;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		// 停10秒钟, 想系统短信数据库中写一条短信
		new Thread(new Runnable() {
			@Override
			public void run() {
				SystemClock.sleep(10 * 1000);
				
				Uri uri = Uri.parse("content://sms/");	// 操作sms表的uri
				
				ContentValues values = new ContentValues();
				values.put("address", "95555");
				values.put("type", "1");
				values.put("body", "您的尾号为8890的账户, 收到100, 000, 000, 000.00元的转账. 活期余额为: 899, 777, 000, 111, 000.00元");
				getContentResolver().insert(uri, values);
			}
		}).start();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

查询和添加联系人

查询联系人:raw_contacts, data

 

查询:

1. 去raw_contacts表中取所有联系人的_id

2. 去data表中根据上面取到的_id查询对应id的数据.

 

content://com.android.contacts/raw_contacts

content://com.android.contacts/data

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:onClick="queryContacts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查询所有联系人" />

    <Button
        android:onClick="addContacts"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="添加联系人" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.contacts"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_CONTACTS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.contacts.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.itheima28.contacts;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends Activity {

	private static final String TAG = "MainActivity";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	private void printCursor(Cursor cursor) {
		if(cursor != null && cursor.getCount() > 0) {
			
			while(cursor.moveToNext()) {
				
				int columnCount = cursor.getColumnCount(); // 列的总数
				
				for (int i = 0; i < columnCount; i++) {
					String columnName = cursor.getColumnName(i);	// 取对应i位置的列的名称
					String columnValue = cursor.getString(i); // 取出对应i位置的列的值
					
					Log.i(TAG, "当前是第" + cursor.getPosition() + "行: " + columnName + " = " + columnValue);
				}
			}
			cursor.close();
		}
	}

	/**
	 * 查询联系人
	 * @param v
	 */
	public void queryContacts(View v) {
		// 1. 去raw_contacts表中取所有联系人的_id
		Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
		Uri dataUri = Uri.parse("content://com.android.contacts/data");
		
		Cursor cursor = getContentResolver().query(uri, new String[]{"_id"}, null, null, null);
//		printCursor(cursor);
		if(cursor != null && cursor.getCount() > 0) {
			
			while(cursor.moveToNext()) {
				int id = cursor.getInt(0);
				// 2. 去data表中根据上面取到的_id查询对应id的数据.
				
				String selection = "raw_contact_id = ?";
				String[] selectionArgs = {String.valueOf(id)};
				Cursor c = getContentResolver().query(dataUri, new String[]{"data1", "mimetype"}, 
						selection, selectionArgs, null);
				if(c != null && c.getCount() > 0) {
					
					while(c.moveToNext()) {
						String mimetype = c.getString(1);		// 当前取的是mimetype的值
						String data1 = c.getString(0);		// 当前取的是data1数据
						
						if("vnd.android.cursor.item/phone_v2".equals(mimetype)) {
							Log.i(TAG, "号码: " + data1);
						} else if("vnd.android.cursor.item/name".equals(mimetype)) {
							Log.i(TAG, "姓名: " + data1);
						} else if("vnd.android.cursor.item/email_v2".equals(mimetype)) {
							Log.i(TAG, "邮箱: " + data1);
						}
					}
					c.close();
				}
			}
			cursor.close();
		}

	}
	
	public void addContacts(View v) {
		Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
		Uri dataUri = Uri.parse("content://com.android.contacts/data");
		// 1. 在raw_contacts表中添加一个记录
		
		// 取raw_contacts表中contact_id的值
		Cursor cursor = getContentResolver().query(uri, new String[]{"contact_id"}, null, null, "contact_id desc limit 1");
		if(cursor != null && cursor.moveToFirst()) {
			int contact_id = cursor.getInt(0);
			contact_id ++;
			cursor.close();
			
			ContentValues values = new ContentValues();
			values.put("contact_id", contact_id);
			getContentResolver().insert(uri, values);

			// 2. 根据上面添加记录的id, 取data表中添加三条数据
			
			// 存号码
			values = new ContentValues();
			values.put("mimetype", "vnd.android.cursor.item/phone_v2");
			values.put("data1", "10086");
			values.put("raw_contact_id", contact_id);
			getContentResolver().insert(dataUri, values);
			
			// 存姓名
			values = new ContentValues();
			values.put("mimetype", "vnd.android.cursor.item/name");
			values.put("data1", "中国移动");
			values.put("raw_contact_id", contact_id);
			getContentResolver().insert(dataUri, values);
			
			// 存邮箱
			values = new ContentValues();
			values.put("mimetype", "vnd.android.cursor.item/email_v2");
			values.put("data1", "[email protected]");
			values.put("raw_contact_id", contact_id);
			getContentResolver().insert(dataUri, values);
		}

	}
}

内容观察者使用

内容观察者:

发件箱的uri:content://sms/outbox

package com.itheima28.contentobserverdemo;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		// 监听系统短信		
		ContentResolver resolver = getContentResolver();
		
		// 注册一个内容观察者观察短信数据库
		resolver.registerContentObserver(Uri.parse("content://sms/"), true, new MyContentObserver(new Handler()));
	}
	
	/**
	 * @author andong
	 * 内容观察者
	 */
	class MyContentObserver extends ContentObserver {

		private static final String TAG = "MyContentObserver";

		public MyContentObserver(Handler handler) {
			super(handler);
		}

		/**
		 * 当被监听的内容发生改变时回调
		 */
		@Override
		public void onChange(boolean selfChange) {
			Log.i(TAG, "短信改变了");
			Uri uri = Uri.parse("content://sms/outbox");	// 发件箱的uri
			
			// 查询发件箱的内容
			Cursor cursor = getContentResolver().query(uri, new String[]{"address", "date", "body"}, null, null, null);
			if(cursor != null && cursor.getCount() > 0) {
				
				String address;
				long date;
				String body;
				while(cursor.moveToNext()) {
					address = cursor.getString(0);
					date = cursor.getLong(1);
					body = cursor.getString(2);
					
					Log.i(TAG, "号码: " + address + ", 日期: " + date + ", 内容: " + body);
				}
				cursor.close();
			}
		}
	}
}

网络图片查看器

Android notResponding(应用程序无响应) 阻塞了主线程 ANR异常

 

异常:

CalledFromWrongThreadException: Only theoriginal thread that created a view hierarchy can touch its views.

 

只有原始的线程(主线程, ui线程)才能修改view对象.

 

在子线程中修改view的显示状态, 会报上面异常.

子线程网络图片查看器和Handler消息处理器

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.netphoto"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
<!--     访问网络的权限 -->
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.netphoto.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/iv_icon"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <EditText
            android:id="@+id/et_url"
            android:layout_width="0dip"
            android:text="http://imgstatic.baidu.com/img/image/d833c895d143ad4bf450b6dd80025aafa40f06b4_%E5%89%AF%E6%9C%AC.jpg"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:layout_weight="1" />

        <Button
            android:id="@+id/btn_submit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Go"
            android:textSize="20sp" />
    </LinearLayout>

</LinearLayout>

package com.itheima28.netphoto;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private static final String TAG = "MainActivity";
	protected static final int ERROR = 1;
	private EditText etUrl;
	private ImageView ivIcon;
	private final int SUCCESS = 0;
	
	private Handler handler = new Handler() {

		/**
		 * 接收消息
		 */
		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			
			Log.i(TAG, "what = " + msg.what);
			if(msg.what == SUCCESS) {	// 当前是访问网络, 去显示图片
				ivIcon.setImageBitmap((Bitmap) msg.obj);		// 设置imageView显示的图片
			} else if(msg.what == ERROR) {
				Toast.makeText(MainActivity.this, "抓去失败", 0).show();
			}
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		ivIcon = (ImageView) findViewById(R.id.iv_icon);
		etUrl = (EditText) findViewById(R.id.et_url);
		
		findViewById(R.id.btn_submit).setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		final String url = etUrl.getText().toString();
		
		new Thread(new Runnable() {

			@Override
			public void run() {
				Bitmap bitmap = getImageFromNet(url);

//				ivIcon.setImageBitmap(bitmap);		// 设置imageView显示的图片
				if(bitmap != null) {
					Message msg = new Message();
					msg.what = SUCCESS;
					msg.obj = bitmap;
					handler.sendMessage(msg);
				} else {
					Message msg = new Message();
					msg.what = ERROR;
					handler.sendMessage(msg);
				}
			}}).start();
		
	}

	/**
	 * 根据url连接取网络抓去图片返回
	 * @param url
	 * @return url对应的图片
	 */
	private Bitmap getImageFromNet(String url) {
		HttpURLConnection conn = null;
		try {
			URL mURL = new URL(url);	// 创建一个url对象
			
			// 得到http的连接对象
			conn = (HttpURLConnection) mURL.openConnection();
			
			conn.setRequestMethod("GET");		// 设置请求方法为Get
			conn.setConnectTimeout(10000);		// 设置连接服务器的超时时间, 如果超过10秒钟, 没有连接成功, 会抛异常
			conn.setReadTimeout(5000);		// 设置读取数据时超时时间, 如果超过5秒, 抛异常
			
			conn.connect();		// 开始链接
			
			int responseCode = conn.getResponseCode(); // 得到服务器的响应码
			if(responseCode == 200) {
				// 访问成功
				InputStream is = conn.getInputStream();	// 获得服务器返回的流数据
				
				Bitmap bitmap = BitmapFactory.decodeStream(is); // 根据 流数据 创建一个bitmap位图对象
				
				return bitmap;
			} else {
				Log.i(TAG, "访问失败: responseCode = " + responseCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(conn != null) {
				conn.disconnect();		// 断开连接
			}
		}
		return null;
	}
}

html查看器

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.htmldemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.htmldemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <EditText
            android:id="@+id/et_url"
            android:layout_width="0dip"
            android:text="http://www.baidu.com"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:layout_weight="1" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="getHtml"
            android:text="GO" />
    </LinearLayout>

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <TextView
            android:id="@+id/tv_html"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </ScrollView>

</LinearLayout>

package com.itheima28.htmldemo;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private static final String TAG = "MainActivity";
	private static final int SUCCESS = 0;
	protected static final int ERROR = 1;
	private EditText etUrl;
	private TextView tvHtml;
	
	private Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
			case SUCCESS:
				 tvHtml.setText((String) msg.obj);
				break;
			case ERROR:
				Toast.makeText(MainActivity.this, "访问失败", 0).show();
				break;
			default:
				break;
			}
		}
		
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		etUrl = (EditText) findViewById(R.id.et_url);
		tvHtml = (TextView) findViewById(R.id.tv_html);
		
	}

	public void getHtml(View v) {
		final String url = etUrl.getText().toString();
		
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				// 请求网络
				String html = getHtmlFromInternet(url);
				
				if(!TextUtils.isEmpty(html)) {
					// 更新textview的显示了
					Message msg = new Message();
					msg.what = SUCCESS;
					msg.obj = html;
					handler.sendMessage(msg);
				} else {
					Message msg = new Message();
					msg.what = ERROR;
					handler.sendMessage(msg);
				}
			}
		}).start();
	}

	/**
	 * 根据给定的url访问网络, 抓去html代码
	 * @param url
	 * @return
	 */
	protected String getHtmlFromInternet(String url) {
		
		try {
			URL mURL = new URL(url);
			HttpURLConnection conn = (HttpURLConnection) mURL.openConnection();
			
			conn.setRequestMethod("GET");
			conn.setConnectTimeout(10000);
			conn.setReadTimeout(5000);
			
//			conn.connect();
			
			int responseCode = conn.getResponseCode();
			
			if(responseCode == 200) {
				InputStream is = conn.getInputStream();
				String html = getStringFromInputStream(is);
				return html;
			} else {
				Log.i(TAG, "访问失败: " + responseCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * 根据流返回一个字符串信息
	 * @param is
	 * @return
	 * @throws IOException 
	 */
	private String getStringFromInputStream(InputStream is) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		
		while((len = is.read(buffer)) != -1) {
			baos.write(buffer, 0, len);
		}
		is.close();
		
		String html = baos.toString();	// 把流中的数据转换成字符串, 采用的编码是: utf-8
		
		String charset = "utf-8";
		if(html.contains("gbk") || html.contains("gb2312")
				|| html.contains("GBK") || html.contains("GB2312")) {		// 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
			charset = "gbk";
		}
		
		html = new String(baos.toByteArray(), charset);	// 对原有的字节数组进行使用处理后的编码名称进行编码
		baos.close();
		return html;
	}
}

html查看器乱码问题

	/**
	 * 根据流返回一个字符串信息
	 * @param is
	 * @return
	 * @throws IOException 
	 */
	private String getStringFromInputStream(InputStream is) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		
		while((len = is.read(buffer)) != -1) {
			baos.write(buffer, 0, len);
		}
		is.close();
		
		String html = baos.toString();	// 把流中的数据转换成字符串, 采用的编码是: utf-8
		
		String charset = "utf-8";
		if(html.contains("gbk") || html.contains("gb2312")
				|| html.contains("GBK") || html.contains("GB2312")) {		// 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
			charset = "gbk";
		}
		
		html = new String(baos.toByteArray(), charset);	// 对原有的字节数组进行使用处理后的编码名称进行编码
		baos.close();
		return html;
	}

使用HttpURLConnection采用Post方式请求数据

Servlet服务器程序

package com.itheima28.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String username = request.getParameter("username");	// 采用的编码是: iso-8859-1
		String password = request.getParameter("password");
		
		// 采用iso8859-1的编码对姓名进行逆转, 转换成字节数组, 再使用utf-8编码对数据进行转换, 字符串
		username = new String(username.getBytes("iso8859-1"), "utf-8");
		password = new String(password.getBytes("iso8859-1"), "utf-8");
		
		System.out.println("姓名: " + username);
		System.out.println("密码: " + password);
		
		if("lisi".equals(username) && "123".equals(password)) {
			/*
			 * getBytes 默认情况下, 使用的iso8859-1的编码, 但如果发现码表中没有当前字符, 
			 * 会使用当前系统下的默认编码: GBK
			 */ 
			response.getOutputStream().write("登录成功".getBytes("utf-8"));
		} else {
			response.getOutputStream().write("登录失败".getBytes("utf-8"));
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("doPost");
		doGet(request, response);
	}

}

Android客户端

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheim28.submitdata"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheim28.submitdata.MainActivity2"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_username"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入姓名" />

    <EditText
        android:id="@+id/et_password"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入密码" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="doGet"
        android:text="Get方式提交" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="doPost"
        android:text="Post方式提交" />
</LinearLayout>

package com.itheim28.submitdata.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

import android.util.Log;

public class NetUtils {

	private static final String TAG = "NetUtils";
	
	/**
	 * 使用post的方式登录
	 * @param userName
	 * @param password
	 * @return
	 */
	public static String loginOfPost(String userName, String password) {
		HttpURLConnection conn = null;
		try {
			URL url = new URL("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet");
			
			conn = (HttpURLConnection) url.openConnection();
			
			conn.setRequestMethod("POST");
			conn.setConnectTimeout(10000); // 连接的超时时间
			conn.setReadTimeout(5000); // 读数据的超时时间
			conn.setDoOutput(true);	// 必须设置此方法, 允许输出
//			conn.setRequestProperty("Content-Length", 234);		// 设置请求头消息, 可以设置多个
			
			// post请求的参数
			String data = "username=" + userName + "&password=" + password;
			
			// 获得一个输出流, 用于向服务器写数据, 默认情况下, 系统不允许向服务器输出内容
			OutputStream out = conn.getOutputStream();	
			out.write(data.getBytes());
			out.flush();
			out.close();
			
			int responseCode = conn.getResponseCode();
			if(responseCode == 200) {
				InputStream is = conn.getInputStream();
				String state = getStringFromInputStream(is);
				return state;
			} else {
				Log.i(TAG, "访问失败: " + responseCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(conn != null) {
				conn.disconnect();
			}
		}
		return null;
	}

	/**
	 * 使用get的方式登录
	 * @param userName
	 * @param password
	 * @return 登录的状态
	 */
	public static String loginOfGet(String userName, String password) {
		HttpURLConnection conn = null;
		try {
			String data = "username=" + URLEncoder.encode(userName) + "&password=" + URLEncoder.encode(password);
			URL url = new URL("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet?" + data);
			conn = (HttpURLConnection) url.openConnection();
			
			conn.setRequestMethod("GET");		// get或者post必须得全大写
			conn.setConnectTimeout(10000); // 连接的超时时间
			conn.setReadTimeout(5000); // 读数据的超时时间
			
			int responseCode = conn.getResponseCode();
			if(responseCode == 200) {
				InputStream is = conn.getInputStream();
				String state = getStringFromInputStream(is);
				return state;
			} else {
				Log.i(TAG, "访问失败: " + responseCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(conn != null) {
				conn.disconnect();		// 关闭连接
			}
		}
		return null;
	}
	
	/**
	 * 根据流返回一个字符串信息
	 * @param is
	 * @return
	 * @throws IOException 
	 */
	private static String getStringFromInputStream(InputStream is) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		
		while((len = is.read(buffer)) != -1) {
			baos.write(buffer, 0, len);
		}
		is.close();
		
		String html = baos.toString();	// 把流中的数据转换成字符串, 采用的编码是: utf-8
		
//		String html = new String(baos.toByteArray(), "GBK");
		
		baos.close();
		return html;
	}
}

package com.itheim28.submitdata;

import com.itheim28.submitdata.utils.NetUtils;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

	private EditText etUserName;
	private EditText etPassword;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		etUserName = (EditText) findViewById(R.id.et_username);
		etPassword = (EditText) findViewById(R.id.et_password);
	}

	public void doGet(View v) {
		final String userName = etUserName.getText().toString();
		final String password = etPassword.getText().toString();
		
		new Thread(
				new Runnable() {
					
					@Override
					public void run() {
						// 使用get方式抓去数据
						final String state = NetUtils.loginOfGet(userName, password);
						
						// 执行任务在主线程中
						runOnUiThread(new Runnable() {
							@Override
							public void run() {
								// 就是在主线程中操作
								Toast.makeText(MainActivity.this, state, 0).show();
							}
						});
					}
				}).start();
	}
	
	public void doPost(View v) {
		final String userName = etUserName.getText().toString();
		final String password = etPassword.getText().toString();
		
		new Thread(new Runnable() {
			@Override
			public void run() {
				final String state = NetUtils.loginOfPost(userName, password);
				// 执行任务在主线程中
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						// 就是在主线程中操作
						Toast.makeText(MainActivity.this, state, 0).show();
					}
				});
			}
		}).start();
	}
}

开源项目简介

github.com 开源网站, 一个大的仓库. 存放的都是框架

android-async-http-master.zip

android-smart-image-view-master.zip

 

直接拿来用 最火的android开源项目  csdn的帖子