下载app后自动安装程序

其实很简单，只需要几行代码就好了，首先要到服务器下载apk，然后才能安装，当然不是傻子应该都知道，我这里用到的是Httputils去下载，

这里需要一些权限

?

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

　　

直接贴代码

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package com.exmple.httpxutil;   import java.io.File;   import android.annotation.SuppressLint; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.content.pm.Signature; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ProgressBar;   import com.lidroid.xutils.HttpUtils; import com.lidroid.xutils.exception.HttpException; import com.lidroid.xutils.http.HttpHandler; import com.lidroid.xutils.http.ResponseInfo; import com.lidroid.xutils.http.callback.RequestCallBack;   public class MainActivity extends Activity {     HttpHandler<File> h;     private ProgressBar pa;       @SuppressLint("SdCardPath")     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         Button button = (Button) findViewById(R.id.button);         pa = (ProgressBar) findViewById(R.id.pro);         Button more = (Button) findViewById(R.id.more);         getCode();         more.setOnClickListener(new OnClickListener() {               @Override             public void onClick(View v) {                 Intent ints = new Intent(MainActivity.this, NewActivity.class);                 startActivity(ints);               }         });         button.setOnClickListener(new OnClickListener() {               @Override             public void onClick(View v) {                   HttpUtils http = new HttpUtils();                 final String path = Environment.getExternalStorageDirectory()                         .getPath();                 System.out.println(path);                   h = http.download(                         "http://101.200.142.201:8080/tqyb/baidumap.apk", path                                 + "/badumap.apk", true, true,                         new RequestCallBack<File>() {                             @Override                             public void onStart() {                                 System.out.println("===");                                 System.out.println("开始下载了++++++++++++++");                             }                               @Override                             public void onLoading(long total, long current,                                     boolean isUploading) {                                 System.out.println(total + "=====");                                 System.out.println(current + "=====");                                 System.out.println(isUploading + "=====");                                 pa.setMax((int) total);                                 pa.setProgress((int) current);                             }                               @Override                             public void onFailure(HttpException error,                                     String msg) {                                 System.out.println(error + "+++++++" + msg                                         + "+++++++++");                               }                               @Override                             public void onSuccess(                                     ResponseInfo<File> responseInfo) {                                 h.cancel();                                 installApk(path + "/badumap.apk");                               }                           });               }         });       } //安装的方法     private void installApk(String filename) {         File file = new File(filename);         Intent intent = new Intent();         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);         intent.setAction(Intent.ACTION_VIEW);         String type = "application/vnd.android.package-archive";         intent.setDataAndType(Uri.fromFile(file), type);         startActivity(intent);       } //等到版本号的代码     private void getCode() {           PackageManager manager;           PackageInfo info = null;           manager = this.getPackageManager();           try {               info = manager.getPackageInfo(this.getPackageName(), 0);             String name = info.versionName;             int versionCode = info.versionCode;             String packageName = info.packageName;             Signature[] signatures = info.signatures;             System.out.println(name + "++++++++++" + versionCode + "+++++"                     + packageName + "========nnn" + signatures                     + "=============");             /*              * info.versionName;              *              * info.packageName;              *              * info.signatures;              */           } catch (NameNotFoundException e) {               // TODO Auto-generated catch block               e.printStackTrace();           }       }   }