Android实现手机音量及屏幕亮度调节

播放视频时，调节声音和屏幕亮度是标配啦，简单记录下：

//不要忘记添加权限 ：<uses-permission Android:name="android.permission.WRITE_SETTINGS"/> public class TestActivity extends Activity { private SeekBar voice_seekbar; private SeekBar light_seekbar; private TextView voice_tv; private TextView light_tv; private AudioManager mAudioManager; // 最大音量 private int maxVolume; // 当前音量 private int currentVolume; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE); initViews(); initVolume(); initLight(); } /** * 获取当前屏幕亮度 * * @description： * @author ldm * @date 2016-12-2 下午3:22:20 */ private void initLight() { float currentBright = 0.0f; try { // 系统亮度值范围：0～255，应用窗口亮度范围：0.0f～1.0f。 currentBright = android.provider.Settings.System.getInt( getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS) * 100; } catch (Exception e) { e.printStackTrace(); } light_seekbar.setProgress((int) currentBright); // 转换成百分比 light_tv.setText("当前亮度：" + (int) currentBright + "%"); } private void initViews() { this.voice_seekbar = (SeekBar) findViewById(R.id.voice_seekbar); this.light_seekbar = (SeekBar) findViewById(R.id.light_seekbar); this.voice_tv = (TextView) findViewById(R.id.voice_tv); this.light_tv = (TextView) findViewById(R.id.light_tv); this.voice_seekbar .setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // 设置音量 mAudioManager.setStreamVolume( AudioManager.STREAM_MUSIC, progress, 0); voice_tv.setText("当前音量百分比：" + progress * 100 / maxVolume + " %"); } }); // 调节亮度 this.light_seekbar .setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { WindowManager.LayoutParams lp = getWindow() .getAttributes(); lp.screenBrightness = Float.valueOf(progress) * (1f / 100f); // 调节亮度 getWindow().setAttributes(lp); light_tv.setText("当前亮度：" + progress + "%"); } }); } /** * 初始化音量数据 * * @description： * @author ldm * @date 2016-12-2 下午3:20:05 */ private void initVolume() { // 获取系统最大音量 maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); // 设置voice_seekbar的最大值 voice_seekbar.setMax(maxVolume); // 获取到当前 设备的音量 currentVolume = mAudioManager .getStreamVolume(AudioManager.STREAM_MUSIC); // 显示音量 voice_tv.setText("当前音量百分比：" + currentVolume * 100 / maxVolume + " %"); } }

测试用布局：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/transparent" android:orientation="vertical" android:padding="16dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="调节声音" android:textSize="16sp" /> <SeekBar android:id="@+id/voice_seekbar" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="调节亮度" android:textSize="16sp" /> <SeekBar android:id="@+id/light_seekbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" /> <TextView android:id="@+id/voice_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:textSize="16sp" /> <TextView android:id="@+id/light_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:textSize="16sp" /> </LinearLayout>