Question

我一直试图使用窗口管理器来显示其他应用程序的视图，但是每当我点击开始时，我的设备上就什么也没有发生。我看过其他指南和教程，但是由于某种原因，我无法在设备（Pocophone F1 Android Pie）上显示它。当我将参数类型更改为TYPE_PHONE并在较低的API上运行时，它可以正常工作。当我将其设置为TYPE_APPLICATION OVERLAY并在更高的API上运行时，它不起作用。不知道我在做什么错，将不胜感激。

Manifest.xml

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:ignore="GoogleAppIndexingWarning">

    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <service
        android:name=".MyService"
        android:enabled="true"
        android:exported="false" />
</application>

activity_main.xml

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    tools:ignore="MissingConstraints">

    <Button
        android:id="@+id/notify_me"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start Service" />
</LinearLayout>

popup.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorAccent">

    <TextView
        android:id="@+id/popupText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="THIS IS TEXT FOR TESTING PURPOSES." />
</LinearLayout>

MainActivity.java


public class MainActivity extends AppCompatActivity {
    private static final int CODE_DRAW_OVER_OTHER_APP_PERMISSION = 2084;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (!Settings.canDrawOverlays(this)) {
                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName()));
                startActivityForResult(intent, 0);
            }
        } else {
            initializeView();
        }
    }

    private void initializeView() {
        findViewById(R.id.notify_me).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(new Intent(MainActivity.this, MyService.class));
                finish();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CODE_DRAW_OVER_OTHER_APP_PERMISSION) {
            if (resultCode == RESULT_OK) {
                initializeView();
            } else {
                Toast.makeText(this,
                        "Draw over other app permission not available. Closing the application",
                        Toast.LENGTH_SHORT).show();

                finish();
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

MyService.java

public class MyService extends Service {

    private WindowManager wm;
    private View view;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        view=LayoutInflater.from(this).inflate(R.layout.popup,null);
        wm = (WindowManager) getSystemService(WINDOW_SERVICE);

        final WindowManager.LayoutParams params = new WindowManager.LayoutParams();

        params.width = ViewGroup.LayoutParams.WRAP_CONTENT;
        params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
        params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN|
                WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
        params.format = PixelFormat.TRANSPARENT;
        params.gravity = Gravity.CENTER;
        params.x=0;
        params.y=0;

        wm.addView(view, params);

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        wm.removeView(view);
    }
}

Answer 1

当您为结果启动活动时，您在回叫 onActivityResulty 时正在传递0作为结果代码，您正在对照 CODE_DRAW_OVER_OTHER_APP_PERMISSION 检查结果代码。那没有意义。请在调用 startActivityForResult（）方法时使用 0 进行更改或通过 CODE_DRAW_OVER_OTHER_APP_PERMISSION 。希望这是有道理的。如果仍然有问题，请告诉我。

Window Manager在我的设备上不显示任何内容

1 个答案: