android
下载进度比例显示
博客分类：
android
Android文件下载比例显示
近几天因为在写高清壁纸的服务器端（基于PHP+MySql）,所以好几天没更新博客了，顺便汇报一下高清壁纸的开发进度：服务器端已经改写，原来是一条数据一条数据加，现在是Flash批量上传图片，自动添加数据（这是后台，大家当然看不到啦）。另外，图片数据都放到自己的虚拟主机上了，所以大家可能觉得这几天下载图片特别慢。原来放POCO，速度比较快，但是毕竟是免费的，不放心，怕哪天被人发现了大流量下载，把我帐号图片删了，到时哭都来不及，而且那样也实现不了上传自动添加数据。新版客户端方面，目前多语言以及HVGA支持都已经完成，现在在做下载进度条（因为服务器稍慢，怕有些性子急的同学等不了）。汇报完毕，开始今天学习。今天的这段代码是网上找的，自己做了些小改，通过模拟器测试。文件下载进度条控制（就是为了高清壁纸加个进度条），自己研究了好久，但是进度条只能显示缓存写入文件的进度，不能显示下载进度。找了好久，终于找到一段用的代码，所以记录下来，大家分享。
布局XML：
Xml代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""
/>
<ProgressBar android:id="@+id/down_pb"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="100"
style="?android:attr/progressBarStyleHorizontal"
/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""
/>
<ProgressBar android:id="@+id/down_pb"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="100"
style="?android:attr/progressBarStyleHorizontal"
/>
</LinearLayout>
这个就不用解释了吧，两个控件，一个是TextView,一个是横向条状进度条
程序main.java:
Java代码
package com.pocketdigi.download;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.client.ClientProtocolException;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class main extends Activity {
/** Called when the activity is first created. */
ProgressBar pb;
TextView tv;
int fileSize;
int downLoadFileSize;
String fileEx,fileNa,filename;
private Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{//定义一个Handler，用于处理下载线程与UI间通讯
if (!Thread.currentThread().isInterrupted())
{
switch (msg.what)
{
case 0:
pb.setMax(fileSize);
case 1:
pb.setProgress(downLoadFileSize);
int result = downLoadFileSize * 100 / fileSize;
tv.setText(result + "%");
break;
case 2:
Toast.makeText(main.this, "文件下载完成", 1).show();
break;
case -1:
String error = msg.getData().getString("error");
Toast.makeText(main.this, error, 1).show();
break;
}
}
super.handleMessage(msg);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pb=(ProgressBar)findViewById(R.id.down_pb);
tv=(TextView)findViewById(R.id.tv);
new Thread(){
public void run(){
try {
down_file("http://wallpaper.pocketdigi.com/upload/1/bigImage/1284565196.jpg","/sdcard/");
//下载文件，参数：第一个URL，第二个存放路径
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}
public void down_file(String url,String path) throws IOException{
//下载函数
filename=url.substring(url.lastIndexOf("/") + 1);
//获取文件名
URL myURL = new URL(url);
URLConnection conn = myURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
this.fileSize = conn.getContentLength();//根据响应获取文件大小
if (this.fileSize <= 0) throw new RuntimeException("无法获知文件大小 ");
if (is == null) throw new RuntimeException("stream is null");
FileOutputStream fos = new FileOutputStream(path+filename);
//把数据存入路径+文件名
byte buf[] = new byte[1024];
downLoadFileSize = 0;
sendMsg(0);
do
{
//循环读取
int numread = is.read(buf);
if (numread == -1)
{
break;
}
fos.write(buf, 0, numread);
downLoadFileSize += numread;
sendMsg(1);//更新进度条
} while (true);
sendMsg(2);//通知下载完成
try
{
is.close();
} catch (Exception ex)
{
Log.e("tag", "error: " + ex.getMessage(), ex);
}
}
private void sendMsg(int flag)
{
Message msg = new Message();
msg.what = flag;
handler.sendMessage(msg);
}
package com.pocketdigi.download;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.client.ClientProtocolException;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class main extends Activity {
/** Called when the activity is first created. */
ProgressBar pb;
TextView tv;
int fileSize;
int downLoadFileSize;
String fileEx,fileNa,filename;
private Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{//定义一个Handler，用于处理下载线程与UI间通讯
if (!Thread.currentThread().isInterrupted())
{
switch (msg.what)
{
case 0:
pb.setMax(fileSize);
case 1:
pb.setProgress(downLoadFileSize);
int result = downLoadFileSize * 100 / fileSize;
tv.setText(result + "%");
break;
case 2:
Toast.makeText(main.this, "文件下载完成", 1).show();
break;
case -1:
String error = msg.getData().getString("error");
Toast.makeText(main.this, error, 1).show();
break;
}
}
super.handleMessage(msg);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pb=(ProgressBar)findViewById(R.id.down_pb);
tv=(TextView)findViewById(R.id.tv);
new Thread(){
public void run(){
try {
down_file("http://wallpaper.pocketdigi.com/upload/1/bigImage/1284565196.jpg","/sdcard/");
//下载文件，参数：第一个URL，第二个存放路径
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}
public void down_file(String url,String path) throws IOException{
//下载函数
filename=url.substring(url.lastIndexOf("/") + 1);
//获取文件名
URL myURL = new URL(url);
URLConnection conn = myURL.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
this.fileSize = conn.getContentLength();//根据响应获取文件大小
if (this.fileSize <= 0) throw new RuntimeException("无法获知文件大小 ");
if (is == null) throw new RuntimeException("stream is null");
FileOutputStream fos = new FileOutputStream(path+filename);
//把数据存入路径+文件名
byte buf[] = new byte[1024];
downLoadFileSize = 0;
sendMsg(0);
do
{
//循环读取
int numread = is.read(buf);
if (numread == -1)
{
break;
}
fos.write(buf, 0, numread);
downLoadFileSize += numread;
sendMsg(1);//更新进度条
} while (true);
sendMsg(2);//通知下载完成
try
{
is.close();
} catch (Exception ex)
{
Log.e("tag", "error: " + ex.getMessage(), ex);
}
}
private void sendMsg(int flag)
{
Message msg = new Message();
msg.what = flag;
handler.sendMessage(msg);
}
LinearLayout按下(pressed)或获取焦点（focused)时背景设置不同颜色或图片
博客分类：
android
AndroidXML
Xml代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/myview"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:background="@drawable/myDrawable"
<SPAN style="COLOR: #ff0000"><SPAN style="TEXT-DECORATION: underline">android:clickable="true"</SPAN>
</SPAN>
>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
<item android:state_focused="true" android:state_pressed="true" android:drawable="@color/black" /> <!-- focused and pressed-->
<item android:state_pressed="true" android:drawable="@color/green" /> <!-- pressed -->
<item android:drawable="@color/black" /> <!-- default -->
</selector>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/myview"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:background="@drawable/myDrawable"
android:clickable="true"
>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
<item android:state_focused="true" android:state_pressed="true" android:drawable="@color/black" /> <!-- focused and pressed-->
<item android:state_pressed="true" android:drawable="@color/green" /> <!-- pressed -->
<item android:drawable="@color/black" /> <!-- default -->
</selector>
千万注意上面红色标注的地方，一定要加这个属性，不然不起作用,另外在color.xml中可以定义drawable和color等多种属性，害我老是报找不到@color匹配的项，原来一直都在写drawable，尼玛！！！！！