Android 控件 - 悬浮常驻文本交互（IBinder 实现、BroadcastReceiver 实现）

IBinder 实现

1、Service

FloatTextService.java

java 复制代码

public class FloatTextService extends Service {

    private TextView tvFloat;
    private WindowManager windowManager;

    private final IBinder binder = new FloatTextServiceBinder();

    public class FloatTextServiceBinder extends Binder {
        public FloatTextService getService() {
            return FloatTextService.this;
        }
    }

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

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

        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        // 创建布局参数
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ?
                        WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY :
                        WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT
        );

        // 设置位置为左下角
        params.gravity = Gravity.BOTTOM | Gravity.START;
        params.x = 0;
        params.y = 0;

        LayoutInflater inflater = LayoutInflater.from(this);
        tvFloat = (TextView) inflater.inflate(R.layout.float_text, null);

        // 添加到窗口
        windowManager.addView(tvFloat, params);
    }

    public void showFloatText(String text) {
        tvFloat.setText(text);
    }

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

        if (tvFloat != null) {
            windowManager.removeView(tvFloat);
        }
    }
}

float_text.xml

xml 复制代码

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tv_float"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="12dp"
    android:textSize="14sp" />

2、Manifest

AndroidManifest.xml

xml 复制代码

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

<application>

    ...

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

3、Activity Layout

activity_float_text_service_test.xml

xml 复制代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".viewfixed.FloatTextServiceTestActivity">

    <Button
        android:id="@+id/btn_show_float_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示悬浮文本"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

4、Activity Code

FloatTextServiceTestActivity.java

java 复制代码

public class FloatTextServiceTestActivity extends AppCompatActivity {

    private ActivityResultLauncher<Intent> floatPermissionLauncher;

    private FloatTextService floatTextService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_float_text_service_test);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        test();
    }

    private void test() {
        floatPermissionLauncher = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (checkFloatPermission()) {
                        createFloatText();
                    } else {
                        Toast.makeText(this, "未开启浮窗权限", Toast.LENGTH_SHORT).show();
                    }
                }
        );

        if (checkFloatPermission()) {
            createFloatText();
        } else {
            requestFloatPermission();
        }

        Button btnShowFloatText = findViewById(R.id.btn_show_float_text);
        btnShowFloatText.setOnClickListener(v -> {
            floatTextService.showFloatText("Hello Float Text");
        });
    }

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

    private void requestFloatPermission() {
        Intent intent = new Intent(
                Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + getPackageName())
        );
        floatPermissionLauncher.launch(intent);
    }

    private void createFloatText() {
        bindService(new Intent(this, FloatTextService.class), new ServiceConnection() {

            @Override
            public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
                FloatTextService.FloatTextServiceBinder binder = (FloatTextService.FloatTextServiceBinder) iBinder;
                floatTextService = binder.getService();
            }

            @Override
            public void onServiceDisconnected(ComponentName componentName) {
            }
        }, BIND_AUTO_CREATE);
    }
}

BroadcastReceiver 实现

1、Service

FloatTextService.java

java 复制代码

public class FloatTextService extends Service {

    private TextView tvFloat;
    private WindowManager windowManager;

    private final IBinder binder = new FloatTextServiceBinder();

    public class FloatTextServiceBinder extends Binder {
        public FloatTextService getService() {
            return FloatTextService.this;
        }
    }

    public static final String ACTION = "SHOW_FLOAT_TEXT";

    private BroadcastReceiver FloatTextServiceBroadcastReceiver;

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

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

        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        // 创建布局参数
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ?
                        WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY :
                        WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT
        );

        // 设置位置为左下角
        params.gravity = Gravity.BOTTOM | Gravity.START;
        params.x = 0;
        params.y = 0;

        LayoutInflater inflater = LayoutInflater.from(this);
        tvFloat = (TextView) inflater.inflate(R.layout.float_text, null);

        // 添加到窗口
        windowManager.addView(tvFloat, params);

        FloatTextServiceBroadcastReceiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {
                if (intent.hasExtra("text")) {
                    String newText = intent.getStringExtra("text");
                    tvFloat.setText(newText);
                }
            }
        };

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ACTION);
        registerReceiver(FloatTextServiceBroadcastReceiver, intentFilter);
    }

    public void showFloatText(String text) {
        tvFloat.setText(text);
    }

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

        if (tvFloat != null) {
            windowManager.removeView(tvFloat);
        }
    }
}

float_text.xml

xml 复制代码

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tv_float"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="12dp"
    android:textSize="14sp" />

2、Manifest

AndroidManifest.xml

xml 复制代码

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

<application>

    ...

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

3、Activity Layout

activity_float_text_service_test.xml

xml 复制代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".viewfixed.FloatTextServiceTestActivity">

    <Button
        android:id="@+id/btn_show_float_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示悬浮文本"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

4、Activity Code

FloatTextServiceTestActivity.java

java 复制代码

public class FloatTextServiceTestActivity extends AppCompatActivity {

    private ActivityResultLauncher<Intent> floatPermissionLauncher;

    private FloatTextService floatTextService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_float_text_service_test);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        test();
    }

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

    private void requestFloatPermission() {
        Intent intent = new Intent(
                Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + getPackageName())
        );
        floatPermissionLauncher.launch(intent);
    }

    private void createFloatText() {
        bindService(new Intent(this, FloatTextService.class), new ServiceConnection() {

            @Override
            public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
                FloatTextService.FloatTextServiceBinder binder = (FloatTextService.FloatTextServiceBinder) iBinder;
                floatTextService = binder.getService();
            }

            @Override
            public void onServiceDisconnected(ComponentName componentName) {
            }
        }, BIND_AUTO_CREATE);
    }

    private void test() {
        floatPermissionLauncher = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (checkFloatPermission()) {
                        createFloatText();
                    } else {
                        Toast.makeText(this, "未开启浮窗权限", Toast.LENGTH_SHORT).show();
                    }
                }
        );

        if (checkFloatPermission()) {
            createFloatText();
        } else {
            requestFloatPermission();
        }

        Button btnShowFloatText = findViewById(R.id.btn_show_float_text);
        btnShowFloatText.setOnClickListener(v -> {
            Intent intent = new Intent(FloatTextService.ACTION);
            intent.putExtra("text", "Hello Float Text");
            sendBroadcast(intent);
        });
    }
}