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：

3.编辑AndroidManifest.xml
xmlns:tools="http://schemas.android.com/tools"
package="com.example.myapplication">
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">
android:name="androidx.core.content.FileProvider"
android:authorities="包名"
android:exported="false"
android:grantUriPermissions="true">
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths步骤2中的文件"
/>
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