所有的View设置可点击震动

代码路径

1
/frameworks/base/core/java/android/view/View.java

  1. 导包

    1
    2
    import android.os.Vibrator;
    import android.provider.Settings;

  2. 声明变量

    1
    private Vibrator mVibrator;

  3. 获取服务
    在View的构造方法里获取

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
      /**
       * Simple constructor to use when creating a view from code.
       *
       * @param context The Context the view is running in, through which it can
       *        access the current theme, resources, etc.
       */
      public View(Context context) {
          mContext = context;
          mResources = context != null ? context.getResources() : null;
          mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED;
          // Set some flags defaults
          mPrivateFlags2 =
                  (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) |
                  (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) |
                  (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) |
                  (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) |
                  (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) |
                  (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT);
          mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
          setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
          mUserPaddingStart = UNDEFINED_PADDING;
          mUserPaddingEnd = UNDEFINED_PADDING;
          mRenderNode = RenderNode.create(getClass().getName(), this);

          if (!sCompatibilityDone && context != null) {
              final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;

              // Older apps may need this compatibility hack for measurement.
              sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1;

              // Older apps expect onMeasure() to always be called on a layout pass, regardless
              // of whether a layout was requested on that View.
              sIgnoreMeasureCache = targetSdkVersion < KITKAT;

              sCompatibilityDone = true;
    }
    	/** add for view 触摸时震动 start **/
    	 mVibrator = (Vibrator) mContext.getSystemService(Context.VIBRATOR_SERVICE);
    	// end add
      }

  4. 触发震动
    在playSoundEffect() 函数触发

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
      /**
       * Play a sound effect for this view.
       *
       * <p>The framework will play sound effects for some built in actions, such as
       * clicking, but you may wish to play these effects in your widget,
       * for instance, for internal navigation.
       *
       * <p>The sound effect will only be played if sound effects are enabled by the user, and
       * {@link #isSoundEffectsEnabled()} is true.
       *
       * @param soundConstant One of the constants defined in {@link SoundEffectConstants}
       */
      public void playSoundEffect(int soundConstant) {
          if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
              return;
          }
    /** add for view 触摸时震动 start **/
         boolean vibratorEnabled = Settings.System.getInt(mContext.getContentResolver(),Settings.System.HAPTIC_FEEDBACK_ENABLED,1)==1;
         if(mVibrator !=null && vibratorEnabled ){
                 try {
                     mVibrator.vibrate(50);
                 } catch (Exception e) {
                     android.util.Log.v("View","Exception"+e.toString());
                 }
         }
         // end add

          mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
      }