标签：android style blog http color 使用 os 文件
在上一篇博客中，我们学习了显示设置中休眠设置和屏保设置的基本内容。在这一篇中我们来学习设备亮度的调节，首先还是学习在DisplaySettings.xml增加了一个叫做BrightnessPreference的preference的选项用来控制亮度调节。
步骤1：当用户点击BrightnessPreference的时候，由BrightnessPreference做对应的处理（注：其实是发送了一个广播）
1 public class BrightnessPreference extends Preference { 2 3 public BrightnessPreference(Context context, AttributeSet attrs) { 4 super(context, attrs); 5 } 6 7 @Override 8 protected void onClick() { 9 //发送了一个显示亮度调节对话框的广播 10 Intent intent = new Intent(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG); 11 getContext().sendBroadcastAsUser(intent, UserHandle.CURRENT_OR_SELF); 12 } 13 }
步骤2：对广播的注册并处理，有一个SettingsUI的类继承自SystemUI，该类负责监听上面的广播并进行处理，详见：
1 public class SettingsUI extends SystemUI { 2 private static final String TAG = "SettingsUI"; 3 private static final boolean DEBUG = false; 4 private final Handler mHandler = new Handler(); 5 private BrightnessDialog mBrightnessDialog; 6 private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { 7 @Override 8 public void onReceive(Context context, Intent intent) { 9 String action = intent.getAction(); 10 if (action.equals(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG)) { 11 if (DEBUG) Log.d(TAG, "showing brightness dialog"); 12 if (mBrightnessDialog == null) { 13 mBrightnessDialog = new BrightnessDialog(mContext); 14 mBrightnessDialog.setOnDismissListener(new DialogInterface.OnDismissListener() { 15 @Override 16 public void onDismiss(DialogInterface dialog) { 17 mBrightnessDialog = null;}}); 18 } 19 if (!mBrightnessDialog.isShowing()) { 20 //显示亮度调节的dialog 21 mBrightnessDialog.show(); } 22 } else { 23 Log.w(TAG, "unknown intent: " + intent);}}}; 24 25 public void start() { 26 //监听ACTION_SHOW_BRIGHTNESS_DIALOG广播 27 IntentFilter filter = new IntentFilter(); 28 filter.addAction(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG); 29 mContext.registerReceiverAsUser(mIntentReceiver, UserHandle.ALL, filter, null, mHandler); 30 }
步骤3：上面是负责显示亮度调节的对话框，具体的设置需要查看BrightnessDialog，详见：
1 /** 2 * Create the brightness dialog and any resources that are used for the 3 * entire lifetime of the dialog. 4 */ 5 @Override 6 public void onCreate(Bundle savedInstanceState) { 7 super.onCreate(savedInstanceState); 8 //这里使用了Window，使我们的亮度调节的对话框能在全局界面显示 9 Window window = getWindow(); 10 window.setType(WindowManager.LayoutParams.TYPE_VOLUME_OVERLAY); 11 window.getAttributes().privateFlags |= 12 WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; 13 window.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); 14 window.requestFeature(Window.FEATURE_NO_TITLE); 15 //加载我们的对话框布局文件，其实就是一个ImageView（开关）和com.android.systemui.settings.ToggleSlider（拖动条） 16 setContentView(R.layout.quick_settings_brightness_dialog); 17 setCanceledOnTouchOutside(true); //触摸其他部位就隐藏该dialog 18 } 19 @Override 20 protected void onStart() { 21 super.onStart(); 22 //当我们点击或者拖动ToggleSlider都是有BrightnessController进行处理的 23 mBrightnessController = new BrightnessController(getContext(), 24 (ImageView) findViewById(R.id.brightness_icon), 25 (ToggleSlider) findViewById(R.id.brightness_slider)); 26 dismissBrightnessDialog(mBrightnessDialogLongTimeout); 27 mBrightnessController.addStateChangedCallback(this); 28 }
步骤4： BrightnessController详解
Android 系统设置中显示设置之亮度调节篇,布布扣,bubuko.com
标签：android style blog http color 使用 os 文件
原文地址：http://www.cnblogs.com/yinhaojun/p/3876132.html
