安卓修改系统的屏幕亮度

逃离我推掉我的手 2022-09-17 12:16 248阅读 0赞

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首先要添加系统权限<uses-permission android:name="android.permission.WRITE\_SETTINGS" />

Activity里面的代码如下

seekBar = (SeekBar)layout.findViewById(R.id.seekBar1);  
      text2 = (TextView)layout.findViewById(R.id.textView3);  
      checkbox = (CheckBox)layout.findViewById(R.id.checkBox1);  
       
         //进度条绑定最大亮度，255是最大亮度  
         seekBar.setMax(255);  
         //取得当前亮度  
         int normal = Settings.System.getInt(getContentResolver(),  
     Settings.System.SCREEN\_BRIGHTNESS, 255);  
         text2.setText(String.valueOf(normal));  
          
       
         //进度条绑定当前亮度  
         seekBar.setProgress(normal);  
         seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() \{  
      
    @Override  
    public void onStopTrackingTouch(SeekBar seekBar) \{  
     //取得当前进度  
      checkbox.setChecked(false);   
     int tmpInt = seekBar.getProgress();  
     text2.setText(String.valueOf(tmpInt));  
     //当进度小于80时，设置成80，防止太黑看不见的后果。  
     if (tmpInt < 40) \{  
      tmpInt = 40;  
     \}  
       
     //根据当前进度改变亮度  
     Settings.System.putInt(getContentResolver(),  
       Settings.System.SCREEN\_BRIGHTNESS, tmpInt);  
     tmpInt = Settings.System.getInt(getContentResolver(),  
       Settings.System.SCREEN\_BRIGHTNESS, -1);  
     WindowManager.LayoutParams wl = getWindow()  
       .getAttributes();

float tmpFloat = (float) tmpInt / 255;  
     if (tmpFloat > 0 && tmpFloat <= 1) \{  
      wl.screenBrightness = tmpFloat;  
     \}  
     getWindow().setAttributes(wl);  
       
    \}

@Override  
    public void onStartTrackingTouch(SeekBar seekBar) \{  
     // TODO Auto-generated method stub  
    \}  
      
    @Override  
    public void onProgressChanged(SeekBar seekBar, int progress,  
      boolean fromUser) \{  
     // TODO Auto-generated method stub  
    \}  
   \});  
   checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() \{  
      
    @Override  
    public void onCheckedChanged(CompoundButton arg0, boolean arg1) \{  
     // TODO 自动生成的方法存根  
     text2.setText("150");  
     int light = 150;  
     Settings.System.putInt(getContentResolver(),  
       Settings.System.SCREEN\_BRIGHTNESS, light);  
     light = Settings.System.getInt(getContentResolver(),  
       Settings.System.SCREEN\_BRIGHTNESS, -1);  
     WindowManager.LayoutParams wl = getWindow()  
       .getAttributes();

float tmpFloat = (float) light / 255;  
     if (tmpFloat > 0 && tmpFloat <= 1) \{  
      wl.screenBrightness = tmpFloat;  
     \}  
     getWindow().setAttributes(wl);  
                  
    \}  
   \});

xml的代码

[Center]: /images/20220828/358327ff73794bd98510c770289fbe9b.png
[http_schemas.android.com_apk_res_android]: http://schemas.android.com/apk/res/android