在单个按钮上的多个触摸android

问题描述:

我有一个按钮的应用程序,我正在尝试处理多点触控事件。目前我正在使用触摸方式,并寻找MotionEven.ACTION_DOWNMotionEven.ACTION_UP来跟踪触摸事件。如果同时触摸两个按钮,这可以正常工作。但是,我想让这些按钮在用单个手指触摸时具有一种行为,并且在用更多的手指触摸时具有不同的行为。例如,如果您用一个手指触摸该按钮变为红色的按钮,如果用2个手指触摸该按钮变为黄色的按钮,如果用3个手指触摸按钮,则变为绿色等等。在单个按钮上的多个触摸android

我遇到的问题是,当我用多个手指触摸按钮时,第二次触摸似乎不会触发事件。我如何检测同一按钮上的多个触摸?

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HTTPS:/ /github.com/devunwired/custom-touch-examples这个存储库可能会有所帮助。 – Raghunandan

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我在找哪个确切的例子? – user381261

这是你想要的东西的基础知识。它可能并不完全是你想要的,因为手指之间必须有一些空间,我曾经认识到这一点。如果两个手指靠在一起,它将ACTION_MOVE作为MotionEvent。如果你真的需要,你可能会解释这些&确定是否有两个或更多的手指紧靠在一起。 MotionEvent

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private static final int MAX_TOUCHES = 3; 

    private View buttonView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     buttonView = findViewById(R.id.button_view); 
     buttonView.setOnTouchListener(new View.OnTouchListener() { 
      boolean eventConsumed = false; 

      // Only handling these 4 events means that there must be some space 
      //  between fingers when touching 
      @Override 
      public boolean onTouch(View view, MotionEvent motionEvent) { 
       Log.d(TAG, "" + motionEvent.toString()); 
       switch (motionEvent.getActionMasked()) { 
        case MotionEvent.ACTION_DOWN: 
        case MotionEvent.ACTION_POINTER_DOWN: 
         setButtonColor(motionEvent.getPointerCount()); 
         eventConsumed = true; 
         break; 

        case MotionEvent.ACTION_UP: 
        case MotionEvent.ACTION_POINTER_UP: 
         // subtract 1 from the count, this event still includes the touch just removed 
         setButtonColor(motionEvent.getPointerCount() - 1); 
         eventConsumed = true; 
         break; 

        default: 
         break; 
       } 

       return eventConsumed; 
      } 
     }); 
    } 

    private void setButtonColor(int count) { 
     Log.d(TAG, "count = " + count); 

     if(count < 0) { 
      count = 0; 
     } else if(count > MAX_TOUCHES) { 
      count = MAX_TOUCHES; 
     } 

     switch (count) { 
      case 0: 
       buttonView.setBackgroundColor(getButtonColor(R.color.colorNotPressed)); 
       break; 

      case 1: 
       buttonView.setBackgroundColor(getButtonColor(R.color.colorRed)); 
       break; 

      case 2: 
       buttonView.setBackgroundColor(getButtonColor(R.color.colorYellow)); 
       break; 

      case 3: 
       buttonView.setBackgroundColor(getButtonColor(R.color.colorGreen)); 
       break; 

      default: 
       break; 
     } 
    } 

    // This keeps you from getting a warning about getResources().getColor() being deprecated 
    @SuppressWarnings(value = "deprecation") 
    private int getButtonColor(int id) { 
     int color; 

     if(Build.VERSION.SDK_INT >= 23) { 
      color = getColor(id); 
     } else { 
      color = getResources().getColor(id); 
     } 
     return color; 
    } 
} 

activity_main.xml中(不包括AppBar或FAB东西)

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="@color/colorPrimary" 
    > 

    <View 
     android:layout_width="250dp" 
     android:layout_height="250dp" 
     android:layout_centerInParent="true" 
     android:text="Big Button" 
     android:background="@color/colorNotPressed" 
     android:id="@+id/button_view" 
     /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerInParent="true" 
     android:text="Big Button" 
     android:textSize="20sp" 
     /> 

</RelativeLayout> 

有了这些你colors.xml文件

<color name="colorNotPressed">#606060</color> 
<color name="colorRed">#FF0000</color> 
<color name="colorYellow">#FFFF00</color> 
<color name="colorGreen">#00FF00</color>