APK版本更新，軟件下載更新，通知欄顯示進度

![](http://i.imgur.com/aIf0s3r.gif)

首先你要添加權限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

然后 只要啟動一個服務就可以實現軟件下載更新，通知欄顯示進度

package com.example.updateservice;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
public class MainActivity extends Activity {
Context mContext;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mContext = this;
    showDialog();
}
private void showDialog(){
    AlertDialog.Builder builder = new Builder(mContext);
    builder.setTitle("升級提示");
    builder.setMessage("版本：1.0.1\n大小：6.5M\n1、修改Bug\n2、增加功能");
    builder.setNegativeButton("稍后再說", new AlertDialog.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
        dialog.dismiss();

    }
});

builder.setPositiveButton("馬上跟新", new AlertDialog.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {
        dialog.dismiss();
        Intent intent = new Intent(mContext,DownloadService.class);
        intent.putExtra("url", "http://surveyapp.fy.chaoxing.com/app/LauncherDemo5.apk");
        startService(intent);
    }
});
builder.show();

}
}</pre>

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