Android6.0以上添加原生動態權限

首先AndroidMenifest.xml裏面需要添加權限申請：

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

build.gradle裏面添加依賴：

implementation 'androidx.appcompat:appcompat:1.1.0'

Activity裏面添加動態權限申請代碼:

import android.Manifest;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import static android.content.pm.PackageManager.PERMISSION_DENIED;
import static com.example.chinaweather.WeatherApp.TAG;

public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE = 1001;
    private static final int REQUEST_CODE_SYSTEM_ALERT = 1002;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        if(checkAppPemisstionDenied()){
            Log.d(TAG,"requestPermissions ");
            ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.INTERNET,
                    Manifest.permission.SYSTEM_ALERT_WINDOW,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_CODE);
        }else {
            Log.d(TAG,"no need to requestPermissions ");
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        Log.d(TAG,"onRequestPermissionsResult "+permissions[0]+" "+grantResults[0]);
        Log.d(TAG,"onRequestPermissionsResult "+permissions[1]+" "+grantResults[1]);
        if(!hasSystemAlertPermission()){
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, REQUEST_CODE_SYSTEM_ALERT);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(data==null){
            Log.d(TAG,"onActivityResult SYSTEM_ALERT requestCode "+requestCode+" resultCode "+resultCode);
            return;
        }
        Log.d(TAG,"onActivityResult SYSTEM_ALERT requestCode "+requestCode+" resultCode "+resultCode+" intent "+data.toString());

    }

    private boolean checkAppPemisstionDenied() {
        return ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET)==PERMISSION_DENIED ||
                ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.SYSTEM_ALERT_WINDOW)==PERMISSION_DENIED||
                ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)==PERMISSION_DENIED||
        ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)==PERMISSION_DENIED;
    }

    private boolean hasSystemAlertPermission(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            return Settings.canDrawOverlays(this);
        }
        return true;
    }
}