Android实现手机音量及屏幕亮度调节

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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;@Overrideprotected 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() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic 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() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic 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>

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