Android客户端与服务器端的json数据交互,主要是通过json形式的数据交互,就是json的写入和解析。
先看效果图,我最讨厌讲东西,一个图没有的。
算了,看来我不是写博客的材料,写不下去了,要排版之类的麻烦,大家还是直接去下载源码,里面有大量的注视,应该能看懂。 下载地址:源码下载地址
登录界面:很传统的随便做了一下:
用的是android4.0的,别人说这样的EditText很有科技感。
注册界面:
也是很传统的,文本框之类的 。
下面看看包名,类名图。(忙着和比人聊天了,差点忘了) 现在继续
下面贴上客户端的代码:
LoginRegisterActivity.java
package com.gem.hsx.activity;
import com.gem.hsx.operation.Operaton;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
//此为主activity的实现登录的。在android2.3以后,android规定了主activity不允许在主线程中做一些耗时较多的
//操作,包括网络的操作,主要是减少应用程序停止响应的问题。下面注释掉的部分是网上找到的方法,加上之后就可以在主线程中
//进行联网操作了,但是本人采用了线程的操作,未采用该方法
public class LoginRegisterActivity extends Activity {
Button login;
Button register;
EditText etusername;
EditText etpassword;
String username;
String password;
ProgressDialog p;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
// .detectDiskReads()
// .detectDiskWrites()
// .detectNetwork() // or .detectAll() for all detectable problems
// .penaltyLog()
// .build());
// StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
// .detectLeakedSqlLiteObjects()
// .penaltyLog()
// .penaltyDeath()
// .build());
init();
register.setOnClickListener(new RegisterOnclick());
login.setOnClickListener(new LoginOnclick());
}
private void init()
{
etusername=(EditText) findViewById(R.id.etusername);
etpassword=(EditText) findViewById(R.id.etpassword);
login=(Button) findViewById(R.id.login);
register=(Button) findViewById(R.id.register);
p=new ProgressDialog(LoginRegisterActivity.this);
p.setTitle("登录中");
p.setMessage("登录中,马上就好");
}
private class RegisterOnclick implements OnClickListener
{
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(LoginRegisterActivity.this, Register.class);
startActivity(intent);
}
}
private class LoginOnclick implements OnClickListener
{
public void onClick(View arg0) {
username=etusername.getText().toString().trim();
if (username==null||username.length()<=0)
{
etusername.requestFocus();
etusername.setError("对不起,用户名不能为空");
return;
}
else
{
username=etusername.getText().toString().trim();
}
password=etpassword.getText().toString().trim();
if (password==null||password.length()<=0)
{
etpassword.requestFocus();
etpassword.setError("对不起,密码不能为空");
return;
}
else
{
password=etpassword.getText().toString().trim();
}
p.show();
new Thread(new Runnable() {
public void run() {
Operaton operaton=new Operaton();
String result=operaton.login("Login", username, password);
Message msg=new Message();
msg.obj=result;
handler.sendMessage(msg);
}
}).start();
}
}
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
String string=(String) msg.obj;
p.dismiss();
Toast.makeText(LoginRegisterActivity.this, string, 0).show();
super.handleMessage(msg);
}
};
}
Register.java
package com.gem.hsx.activity;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import com.gem.hsx.bean.User;
import com.gem.hsx.json.WriteJson;
import com.gem.hsx.operation.Operaton;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.Toast;
public class Register extends Activity {
Button submit;
Button select;
EditText etusername;
EditText etpassword;
RadioButton ckman;
RadioButton ckwoman;
EditText etage;
ImageView imgphoto;
String str;
String filepath=null;
String jsonString=null;
ProgressDialog dialog;
private static final int REQUEST_EX = 1;
String username=null;
String password=null;
String sex=null;
String age=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
init();
//etusername.addTextChangedListener(new MyTextWatcher());
etusername.setOnFocusChangeListener(new EtusernameOnFocusChange());
select.setOnClickListener(new SelectOnclick());
submit.setOnClickListener(new SubmitOnclick());
}
private void init()
{
submit=(Button) findViewById(R.id.submit);
select=(Button) findViewById(R.id.select);
etusername=(EditText) findViewById(R.id.etusername);
etpassword=(EditText) findViewById(R.id.etpassword);
ckman=(RadioButton) findViewById(R.id.ckman);
ckwoman=(RadioButton) findViewById(R.id.ckwoman);
etage=(EditText) findViewById(R.id.etage);
imgphoto=(ImageView) findViewById(R.id.imgphoto);
dialog=new ProgressDialog(Register.this);
dialog.setTitle("上传数据中");
dialog.setMessage("请稍等...");
}
// private class MyTextWatcher implements TextWatcher
// {
//
// public void afterTextChanged(Editable s) {
// str=etusername.getText().toString().trim();
// if (str==null||str.length()<=0)
// {
// etusername.setError("用户名不能为空");
// }
// else
// {
// new Thread(new Runnable() {
//
// public void run() {
// Operaton operaton=new Operaton();
// String result= operaton.checkusername("Check", str);
// Message message=new Message();
// message.obj=result;
// handler.sendMessage(message);
// }
// }).start();
//
//
// }
// }
// public void beforeTextChanged(CharSequence s, int start, int count,
// int after) {
//
// }
//
// public void onTextChanged(CharSequence s, int start, int before,
// int count) {
//
// }
//
// }
// Handler handler=new Handler()
// {
// @Override
// public void handleMessage(Message msg) {
// String msgobj=msg.obj.toString();
// if (msgobj=="该用户名可用")
// {
// etusername.setFocusable(false);
// }
// else
// {
// etusername.requestFocus();
// etusername.setError(msgobj);
// }
// super.handleMessage(msg);
// }
// };
//
private class EtusernameOnFocusChange implements OnFocusChangeListener
{
public void onFocusChange(View v, boolean hasFocus) {
if (!etusername.hasFocus()) {
str=etusername.getText().toString().trim();
if (str==null||str.length()<=0)
{
etusername.setError("用户名不能为空");
}
else
{
new Thread(new Runnable() {
//如果用户名不为空,那么将用户名提交到服务器上进行验证,看用户名是否存在,就像JavaEE中利用
//ajax一样,虽然你看不到但是它却偷偷摸摸做了很多
public void run() {
Operaton operaton=new Operaton();
String result= operaton.checkusername("Check", str);
System.out.println("result:"+result);
Message message=new Message();
message.obj=result;
handler.sendMessage(message);
}
}).start();
}
}
}
}
Handler handler=new Handler()
{
@Override
public void handleMessage(Message msg) {
String msgobj=msg.obj.toString();
System.out.println(msgobj);
System.out.println(msgobj.length());
if (msgobj.equals("t")) {
etusername.requestFocus();
etusername.setError("用户名"+str+"已存在");
}
else
{
etpassword.requestFocus();
}
super.handleMessage(msg);
}
};
private class SelectOnclick implements OnClickListener
{
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("explorer_title",
getString(R.string.dialog_read_from_dir));
intent.setDataAndType(Uri.fromFile(new File("/sdcard")), "*/*");
intent.setClass(Register.this, ExDialog.class);
startActivityForResult(intent, REQUEST_EX);
}
}
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (resultCode == RESULT_OK) {
Uri uri = intent.getData();
filepath=uri.toString().substring(6);
System.out.println(filepath);
//用户的头像是不是图片格式
if(filepath.endsWith("jpg")||filepath.endsWith("png"))
{
File file=new File(filepath);
try {
InputStream inputStream=new FileInputStream(file);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
imgphoto.setImageBitmap(bitmap);//如果是就将图片显示出来
} catch (FileNotFoundException e) {
e.printStackTrace();
}
submit.setClickable(true);
}
else
{
submit.setClickable(false);
alert();
}
}
}
private class SubmitOnclick implements OnClickListener
{
public void onClick(View v) {
username=etusername.getText().toString().trim();
password=etpassword.getText().toString().trim();
if (ckman.isChecked()) {
sex="男";
}
else {
sex="女";
}
age=etage.getText().toString().trim();
if (age==null||age.length()<=0)
{
etage.requestFocus();
etage.setError("年龄不能为空");
return ;
}
dialog.show();
new Thread(new Runnable() {
public void run() {
Operaton operaton=new Operaton();
File file=new File(filepath);
String photo=operaton.uploadFile(file, "ImgReciver");
//先进行图片上传的操作,然后服务器返回图片保存在服务器的路径,
System.out.println("photo---->"+photo);
System.out.println("sex:------>"+sex);
User user=new User(username, password, sex, age,photo);
//构造一个user对象
List<User> list=new ArrayList<User>();
list.add(user);
WriteJson writeJson=new WriteJson();
//将user对象写出json形式字符串
jsonString= writeJson.getJsonData(list);
System.out.println(jsonString);
String result= operaton.UpData("Register", jsonString);
Message msg=new Message();
System.out.println("result---->"+result);
msg.obj=result;
handler1.sendMessage(msg);
}
}).start();
}
}
private void alert()
{
Dialog dialog = new AlertDialog.Builder(this)
.setTitle("提示")
.setMessage("您选择的不是有效的图片")
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
filepath = null;
}
})
.create();
dialog.show();
}
Handler handler1=new Handler()
{
@Override
public void handleMessage(Message msg) {
dialog.dismiss();
String msgobj=msg.obj.toString();
if(msgobj.equals("t"))
{
Toast.makeText(Register.this, "注册成功", 0).show();
Intent intent=new Intent();
intent.setClass(Register.this, LoginRegisterActivity.class);
startActivity(intent);
}
else {
Toast.makeText(Register.this, "注册失败", 0).show();
}
super.handleMessage(msg);
}
};
}
ExDialog.java
package com.gem.hsx.activity; import java.io.File; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.ListActivity; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import com.gem.hsx.activity.R; //由于安卓模拟器里面没有文件浏览器,所以构建一个文件浏览器的对话框 主要是dialog和listview配合 //此是一个简单的浏览器主要目的是选择文件后获取文件的路径,借鉴了一些其他人的文件浏览器的写法 public class ExDialog extends ListActivity { private List<Map<String, Object>> mData; private String mDir = "/sdcard"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Intent intent = this.getIntent(); Bundle bl = intent.getExtras(); String title = bl.getString("explorer_title"); Uri uri = intent.getData(); mDir = uri.getPath(); setTitle(title); mData = getData(); MyAdapter adapter = new MyAdapter(this); setListAdapter(adapter); WindowManager m = getWindowManager(); Display d = m.getDefaultDisplay(); LayoutParams p = getWindow().getAttributes(); p.height = (int) (d.getHeight() * 0.8); p.width = (int) (d.getWidth() * 0.95); getWindow().setAttributes(p); } private List<Map<String, Object>> getData() { List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); Map<String, Object> map = null; File f = new File(mDir); File[] files = f.listFiles(); if (!mDir.equals("/sdcard")) { map = new HashMap<String, Object>(); map.put("title", "返回上一级目录/"); map.put("info", f.getParent()); map.put("img", R.drawable.ex_folder); list.add(map); } if (files != null) { for (int i = 0; i < files.length; i++) { map = new HashMap<String, Object>(); map.put("title", files[i].getName()); map.put("info", files[i].getPath()); if (files[i].isDirectory()) map.put("img", R.drawable.ex_folder); else map.put("img", R.drawable.ex_doc); list.add(map); } } return list; } @Override protected void onListItemClick(ListView l, View v, int position, long id) { Log.d("MyListView4-click", (String) mData.get(position).get("info")); if ((Integer) mData.get(position).get("img") == R.drawable.ex_folder) { mDir = (String) mData.get(position).get("info"); mData = getData(); MyAdapter adapter = new MyAdapter(this); setListAdapter(adapter); } else { finishWithResult((String) mData.get(position).get("info")); } } public final class ViewHolder { public ImageView img; public TextView title; public TextView info; } public class MyAdapter extends BaseAdapter { private LayoutInflater mInflater; public MyAdapter(Context context) { this.mInflater = LayoutInflater.from(context); } public int getCount() { return mData.size(); } public Object getItem(int arg0) { return null; } public long getItemId(int arg0) { return 0; } public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.listview, null); holder.img = (ImageView) convertView.findViewById(R.id.img); holder.title = (TextView) convertView.findViewById(R.id.title); // holder.info = (TextView) convertView.findViewById(R.id.info); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.img.setBackgroundResource((Integer) mData.get(position).get( "img")); holder.title.setText((String) mData.get(position).get("title")); //holder.info.setText((String) mData.get(position).get("info")); return convertView; } } private void finishWithResult(String path) { Bundle conData = new Bundle(); conData.putString("results", "Thanks Thanks"); Intent intent = new Intent(); intent.putExtras(conData); Uri startDir = Uri.fromFile(new File(path)); intent.setDataAndType(startDir, "vnd.android.cursor.dir/lysesoft.andexplorer.file"); setResult(RESULT_OK, intent); finish(); } };
JsonUtil.java
package com.gem.hsx.json; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.List; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; public class JsonUtil { public List<?> StringFromJson (String jsondata) { Type listType = new TypeToken<List<?>>(){}.getType(); Gson gson=new Gson(); ArrayList<?> list=gson.fromJson(jsondata, listType); return list; } }
WriteJson.java
package com.gem.hsx.json; import java.util.List; import com.google.gson.Gson; public class WriteJson { /* * 通过引入gson jar包 写入 json 数据 */ public String getJsonData(List<?> list) { //此处要注意,时常会出现说找不到Gson类的情况,这时我们只需要将导入的包和系统提供换换顺序就行了 Gson gson=new Gson();//利用google提供的gson将一个list集合写成json形式的字符串 String jsonstring=gson.toJson(list); return jsonstring; } /* * 当然如果不用gson也可以用传统的方式进行写入json数据或者利用StringBuffer拼字符串 写成json字符串形式 */ }