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實(shí)例詳解用戶輸入 i. 檢測(cè)常用手勢(shì)

更新時(shí)間：2016年01月22日 11:22:36 作者：路邊橋涼

通過本段代碼給大家介紹當(dāng)用戶輸入i檢測(cè)常用手勢(shì)的相關(guān)內(nèi)容，代碼簡(jiǎn)單易懂，感興趣的朋友一起學(xué)習(xí)吧

效果：一個(gè)手指實(shí)現(xiàn)（所有手勢(shì)事件）和（部分事件的）；

A. 所有手勢(shì)

activity_main.xml

<TextView 
android:id="@+id/gesture" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="單擊手勢(shì)變化" /><TextView 
android:id="@+id/doubleTap" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="雙擊手勢(shì)變化" />

MainActivity.java

public class MainActivity extends Activity
{ 
private static final String LOG_TAG = "HelloGesture"; 
private GestureDetector mGestureDetector = null; 
private TextView mGestureTextView = null; 
private TextView mDoubleTapTextView = null; 
@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
mGestureTextView = (TextView) findViewById(R.id.gesture); 
mDoubleTapTextView = (TextView) findViewById(R.id.doubleTap); 
// 構(gòu)造GestureDetector對(duì)象，傳入監(jiān)聽器對(duì)象 
mGestureDetector = new GestureDetector(this, mOnGestureListener); 
// 傳入雙擊監(jiān)聽器對(duì)象 
mGestureDetector.setOnDoubleTapListener(mDoubleTapListener); 
} 
@Override public boolean onTouchEvent(MotionEvent event) 
{ 
// 在onTouchEvent方法中將事件傳遞給手勢(shì)檢測(cè)對(duì)象，否則手勢(shì)監(jiān)聽對(duì)象中的回調(diào)函數(shù)是不會(huì)被調(diào)用的 
mGestureDetector.onTouchEvent(event); 
return super.onTouchEvent(event); 
} 
private OnGestureListener mOnGestureListener = new OnGestureListener()
{ 
@Override 
public boolean onSingleTapUp(MotionEvent e) 
{ 
Log.i(LOG_TAG, "onSingleTapUp: " + e.toString()); 
mGestureTextView.setText("onSingleTapUp: "); 
return false; 
} 
@Override 
public void onShowPress(MotionEvent e) 
{ 
Log.i(LOG_TAG, "onShowPress: " + e.toString()); 
mGestureTextView.setText("onShowPress: "); 
} 
@Override 
public boolean onScroll(MotionEvent e1, MotionEvent e2, 
float distanceX, float distanceY)
{ 
Log.i(LOG_TAG, "onScroll: " + e1.toString() + ", " + e2.toString()); 
mGestureTextView.setText("onScroll "); 
return false; 
} @Override 
public void onLongPress(MotionEvent e)
{ 
Log.i(LOG_TAG, "onLongPress: " + e.toString()); 
mGestureTextView.setText("onLongPress: "); 
} 
@Override 
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
float velocityY) 
{ 
Log.i(LOG_TAG, "onFling: " + e1.toString() + ", " + e2.toString()); 
mGestureTextView.setText("onFling "); 
return false; 
} 
@Override 
public boolean onDown(MotionEvent e) 
{ 
Log.i(LOG_TAG, "onDown: " + e.toString()); 
mGestureTextView.setText("onDown: "); 
return false; 
} 
}; private OnDoubleTapListener mDoubleTapListener = new OnDoubleTapListener() 
{ 
@Override 
public boolean onSingleTapConfirmed(MotionEvent e) 
{ 
Log.i("LOG_TAG", "onSingleTapConfirmed: " + e.toString()); 
mDoubleTapTextView.setText("onSingleTapConfirmed: "); 
return false; 
} 
@Override 
public boolean onDoubleTapEvent(MotionEvent e) 
{ 
Log.i("LOG_TAG", "onDoubleTapEvent: " + e.toString()); 
mDoubleTapTextView.setText("onDoubleTapEvent: "); 
return false; 
} 
@Override 
public boolean onDoubleTap(MotionEvent e) 
{ 
Log.i("LOG_TAG", "onDoubleTap: " + e.toString()); 
mDoubleTapTextView.setText("onDoubleTap: "); 
return false; 
} 
};}

B. 部分手勢(shì)

如果你僅僅只想處理幾種手勢(shì)，你可以選擇繼承GestureDetector.SimpleOnGestureListener類，而不是實(shí)現(xiàn)
GestureDetector.OnGestureListener接口

MainActivity.java

public class MainActivity extends Activity 
{ 
private GestureDetector mGestureDetector = null; 
private TextView mGestureTextView = null; 
private TextView mDoubleTapTextView = null; 
@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
mGestureTextView = (TextView) findViewById(R.id.gesture); 
mDoubleTapTextView = (TextView) findViewById(R.id.doubleTap); 
// 構(gòu)造GestureDetector對(duì)象，傳入監(jiān)聽器對(duì)象 
mGestureDetector = new GestureDetector(this, new MyGestureListener()); 
// 傳入雙擊監(jiān)聽器對(duì)象 
} 
@Override 
public boolean onTouchEvent(MotionEvent event) 
{ 
// 在onTouchEvent方法中將事件傳遞給手勢(shì)檢測(cè)對(duì)象，否則手勢(shì)監(jiān)聽對(duì)象中的回調(diào)函數(shù)是不會(huì)被調(diào)用的 
this.mGestureDetector.onTouchEvent(event); 
return super.onTouchEvent(event); 
} 
class MyGestureListener extends GestureDetector.SimpleOnGestureListener 
{ 
private static final String DEBUG_TAG = "Gestures"; 
@Override 
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
float velocityY) 
{ 
Log.d(DEBUG_TAG, "onFling: " + e1.toString() + ", " + e2.toString()); 
mGestureTextView.setText("onFling "); 
return false; 
} 
@Override 
public boolean onDown(MotionEvent e)
{ 
Log.d(DEBUG_TAG, "onDown: " + e.toString()); 
mGestureTextView.setText("onDown: "); 
return false; 
} 
}}

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