Membuat widget penyesuaian kecerahan yang bagus

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/startService" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="27dp" android:text=" " /> <Button android:id="@+id/stopService" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/startService" android:layout_below="@+id/startService" android:layout_marginTop="39dp" android:text=" " /> </LinearLayout> 

 import android.content.Intent; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.provider.Settings; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //  ,   Android  ,    6   -     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES .M) { if (!Settings.System.canWrite(getApplicationContext())) { Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS, Uri.parse("package:" + getPackageName())); Intent myIntent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION); startActivity(myIntent); startActivity(intent); } else { } } final Button startService = (Button) findViewById(R.id.startService); final Button stopService = (Button) findViewById(R.id.stopService); startService.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startService(new Intent(getApplication(), BrightnessChekingService.class)); } }); stopService.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { stopService(new Intent(getApplication(), BrightnessChekingService.class)); } }); } } 

 import android.app.Service; import android.content.Context; import android.content.Intent; import android.graphics.PixelFormat; import android.os.Build; import android.os.IBinder; import android.provider.Settings; import android.view.Gravity; import android.view.WindowManager; import android.widget.SeekBar; public class BrightnessChekingService extends Service{ private WindowManager windowManager; private WindowManager.LayoutParams params; private VerticalSeekBar seekBar; private Context context; public void onCreate () { super.onCreate(); //    ,     Android,          int LAYOUT_FLAG; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY; } else { LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE; } windowManager = (WindowManager) getSystemService(WINDOW_SERVICE); context = this.getApplicationContext(); seekBar = new VerticalSeekBar(context); seekBar.setMax(255); float alpha = (float) 0.1; seekBar.setAlpha(alpha); params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.MATCH_PARENT, LAYOUT_FLAG, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); params.gravity = Gravity.START; params.x = 0; params.y = 0; params.height = 700; windowManager.addView(seekBar, params); int Brightnes = Settings.System.getInt(context.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 0); seekBar.setProgress(Brightnes); seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){ public void onProgressChanged(SeekBar seekBar, int i, boolean b) { Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS,i); //    ,      seekBar   Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); } public void onStartTrackingTouch(SeekBar seekBar) { } public void onStopTrackingTouch (SeekBar seekBar) { } }); } public void onDestroy() { super.onDestroy(); if (seekBar != null) windowManager.removeView(seekBar); } @Override public IBinder onBind(Intent intent) { return null; } } 

 import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.SeekBar; public class VerticalSeekBar extends SeekBar { public VerticalSeekBar (Context context) { super(context); } public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public VerticalSeekBar(Context context, AttributeSet attrs) { super(context, attrs); } protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(h, w, oldh, oldw); } public synchronized void setProgress(int progress) { super.setProgress(progress); onSizeChanged(getWidth(), getHeight(), 0, 0); } protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(heightMeasureSpec, widthMeasureSpec); setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth()); } protected void onDraw(Canvas c) { c.rotate(-90); c.translate(-getHeight(), 0); super.onDraw(c); } @Override public boolean onTouchEvent(MotionEvent event) { if (!isEnabled()) { return false; } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_UP: setProgress(getMax() - (int) (getMax() * event.getY() / getHeight())); onSizeChanged(getWidth(), getHeight(), 0, 0); break; case MotionEvent.ACTION_CANCEL: break; } return true; } } 

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.bright"> <uses-permission android:name="android.permission.WRITE_SETTINGS" /> <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"> <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=".BrightnessChekingService" android:enabled="true" android:exported="true"></service> </application> </manifest>