Android在一个app中安装并卸载另一个app

1.在app→src→main下新建文件夹asserts，将准备安装的apk文件放在asserts内

2.在app→src→main→res下新建文件夹xml，右击xml文件夹，选择new→XML Resource File，File name为文件名，可随意，本文中为filepaths；Root element为资源类型，输入paths，确定并编辑以下代码：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
 <external-path name="external_files" path="."/>
</paths>

3.编辑AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 package="com.example.myapplication">
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 <application
  android:allowBackup="true"
  android:icon="@mipmap/ic_launcher"
  android:label="@string/app_name"
  android:roundIcon="@mipmap/ic_launcher_round"
  android:supportsRtl="true"
  android:requestLegacyExternalStorage="true"
  android:theme="@style/Theme.MyApplication">
  <provider
   android:name="androidx.core.content.FileProvider"
   android:authorities="包名"
   android:exported="false"
   android:grantUriPermissions="true">
   <meta-data
   android:name="android.support.FILE_PROVIDER_PATHS"
    android:resource="@xml/filepaths步骤2中的文件"
    />
  </provider>
  <activity android:name=".MainActivity">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
 </application>
</manifest>

4.MainActivity.java

public class MainActivity extends AppCompatActivity {
 Context mContext;
 private Button bt,bt0;
 private TextView tx;
 public static boolean isGrantExternalRW(Activity activity) {
 //权限判定
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && activity.checkSelfPermission(
    Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
   activity.requestPermissions(new String[]{
     Manifest.permission.READ_EXTERNAL_STORAGE,
     Manifest.permission.WRITE_EXTERNAL_STORAGE
   }, 1);
   return false;
  }
  return true;
 }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  mContext = this;
  tx=findViewById(R.id.text);
  bt=findViewById(R.id.button);//安装
  bt0=findViewById(R.id.button0);//卸载
//  Toast.makeText(this, ""+Environment.getExternalStorageDirectory().getAbsolutePath(), 0).show();
  if(!this.isGrantExternalRW(MainActivity.this)){return;}//判断是否有权限修改，这很重要
  else{
  if(copyApkFromAssets(this, "app-debug.apk", Environment.getExternalStorageDirectory().getAbsolutePath()+"/app-debug.apk")){
   bt.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     new AlertDialog.Builder(mContext)
       .setIcon(R.drawable.ic_launcher)
       .setMessage("是否安装？")
       .setPositiveButton("yes", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
         Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//         intent.setDataAndType(Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath()+"/app-debug.apk"),
//           "application/vnd.android.package-archive");
         File apkFile = new File(Environment.getExternalStorageDirectory()+"/app-debug.apk");
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
          intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
          Uri uri = FileProvider.getUriForFile(MainActivity.this, "com.example.myapplication", apkFile);
          intent.setDataAndType(uri, "application/vnd.android.package-archive");
         } else {
          intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
         }
         mContext.startActivity(intent);

        }
       }).show();
    }
   });
   bt0.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     Uri packageURI = Uri.parse("package:com.example.a22");//package:+想要卸载的包名
     Intent intent =new Intent(Intent.ACTION_DELETE);
     intent.setData(packageURI);
     mContext.startActivity(intent);
    }
   });
  }

 }}
 public boolean copyApkFromAssets(Context context, String fileName, String path) {
 //将asserts中的apk文件复制到手机存储中
 //可以从手机存储划到最下面，是单独的文件，没有设置文件夹
  boolean copyIsFinish = false;
  try {
   InputStream is = context.getAssets().open(fileName);
   File file = new File(path);
   file.createNewFile();
   FileOutputStream fos = new FileOutputStream(file);
   int length = is.available();
   byte[] temp = new byte[length];
   int i = 0;
   while ((i = is.read(temp)) > 0) {
    fos.write(temp, 0, i);
   }
   fos.close();
   is.close();

   copyIsFinish = true;
  } catch (IOException e) {
   e.printStackTrace();
  }
  return copyIsFinish;
 }
}

网络上的教程有很多自相矛盾，本人防止权限出错，把能加的权限都设置了一遍，有空可以选择测试一下，应该有的可以删掉

到此这篇关于Android在一个app中安装并卸载另一个app的示例代码的文章就介绍到这了,更多相关Android app 安装卸载内容请搜索海外IDC网以前的文章或继续浏览下面的相关文章希望大家以后多多支持海外IDC网！

【转自：http://www.1234xp.com/kt.html 转载请说明出处】