Android在一個app中安裝并卸載另一個app

1.在app→src→main下新建文件夾asserts，將準備安裝的apk文件放在asserts內

2.在app→src→main→res下新建文件夾xml，右擊xml文件夾，選擇new→XML Resource File，File name為文件名，可隨意，本文中為filepaths；Root element為資源類型，輸入paths，確定并編輯以下代碼：

<?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.編輯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步驟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) { //權限判定 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);//安裝 bt0=findViewById(R.id.button0);//卸載// Toast.makeText(this, ''+Environment.getExternalStorageDirectory().getAbsolutePath(), 0).show(); if(!this.isGrantExternalRW(MainActivity.this)){return;}//判斷是否有權限修改，這很重要 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('是否安裝？') .setPositiveButton('yes', new DialogInterface.OnClickListener() {@Overridepublic 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:+想要卸載的包名 Intent intent =new Intent(Intent.ACTION_DELETE); intent.setData(packageURI); mContext.startActivity(intent); } }); } }} public boolean copyApkFromAssets(Context context, String fileName, String path) { //將asserts中的apk文件復制到手機存儲中 //可以從手機存儲劃到最下面，是單獨的文件，沒有設置文件夾 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; }}

網絡上的教程有很多自相矛盾，本人防止權限出錯，把能加的權限都設置了一遍，有空可以選擇測試一下，應該有的可以刪掉

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