一般只需要處理按鈕的點擊事件就可以,但想讓一個按鈕處理多個事件,就得同時監聽多個方法。
OnClickListener 點擊事件
OnLongClickListener 長按事件
OnTouchListener 觸摸事件
同事監聽三個事件,只有 OnTouchListener 會被觸發。
package demo.button;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnCreateContextMenuListener;
import android.view.View.OnLongClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.Toast;
public class TestButtonActivity extends Activity
{
Button test = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
test = (Button) findViewById(R.id.test);
test.setOnClickListener(new MyOnClickListener());
test.setOnLongClickListener(new MyOnLongClickListener());
test.setOnTouchListener(new MyOnTouchListener());
}
class MyOnClickListener implements OnClickListener
{
@Override
public void onClick(View v)
{
Toast.makeText(getApplicationContext(), "單擊事件", Toast.LENGTH_SHORT).show();
}
}
class MyOnLongClickListener implements OnLongClickListener
{
@Override
public boolean onLongClick(View v)
{
Toast.makeText(getApplicationContext(), "長按事件", Toast.LENGTH_SHORT).show();
return true;
}
}
class MyOnTouchListener implements OnTouchListener
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
if (event.getAction() == MotionEvent.ACTION_DOWN)
{
Toast.makeText(getApplicationContext(), "按下按鈕事件", Toast.LENGTH_SHORT).show();
}
if (event.getAction() == MotionEvent.ACTION_UP)
{
Toast.makeText(getApplicationContext(), "彈起按鈕事件", Toast.LENGTH_SHORT).show();
}
//返回true 表示事件處理完畢,會中斷系統對該事件的處理。false 系統會同時處理對應的事件
return true;
}
}
}
監聽button的滑動事件
如果需要捕獲控件的滑動事件,需要實現兩個接口
android.view.GestureDetector.OnGestureListener 捕獲手勢事件,根據需要實現對應的方法(一般需要實現 onFling方法,獲取對應 x,y座標)
android.view.View.OnTouchListener 捕獲觸屏事件
注意:
1. 設置按鈕的 setOnTouchListener(this);
激活 setLongClickable(true);
2.實例化GestureDetector對象 , 在 onTouchEvent 裏面將 return gestureDetector.onTouchEvent(event),將事件傳遞到onFling。
實例
public class MainActivity extends Activity implements OnTouchListener, OnGestureListener
{
Button but = null;
GestureDetector gestureDetector = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
but = (Button) findViewById(R.id.gesture);
but.setOnTouchListener(this);
but.setLongClickable(true);
gestureDetector = new GestureDetector(this);
}
@Override
public boolean onDown(MotionEvent e)
{
Log.d("MainActivity", "**************onDown*******************");
return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY)
{
Log.d("MainActivity", "**************onFling******e1: "+e1.getX()+", "+e1.getY() +" e2: "+e2.getX()+","+e2.getY()+"*****velocityX:"+velocityX+","+velocityY);
/**
* 當 x差值 >100 y差值<200 判斷爲發生左右滑動 . x1> x2 從右向左滑動
*
* 當x差值 <100 y差值>200 判斷爲發生上下滑動 . y1> y2 從下向上滑動
*
*/
float x1 = e1.getX();
float y1 = e1.getY();
float x2 = e2.getX();
float y2 = e2.getY();
if ((Math.abs(x1-x2) > 100) && (Math.abs(y1-y2) < 200 ))
{
if (x1 < x2)
{
Log.d("", "-------自左向右滑動------------");
}
else
{
Log.d("", "-------自右向左滑動------------");
}
}
if ((Math.abs(x1-x2) < 200) && (Math.abs(y1-y2) > 100 ))
{
if (y1 < y2)
{
Log.d("", "-------自上向下滑動------------");
}
else
{
Log.d("", "-------自下向上滑動------------");
}
}
return false;
}
@Override
public void onLongPress(MotionEvent e)
{
Log.d("MainActivity", "**************onLongPress*******************");
//長按時觸發
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY)
{
//Log.d("MainActivity", "**************onScroll*******************");
return false;
}
@Override
public void onShowPress(MotionEvent e)
{
Log.d("MainActivity", "**************onShowPress*******************");
}
@Override
public boolean onSingleTapUp(MotionEvent e)
{
//按下鬆開後觸發
Log.d("MainActivity", "**************onSingleTapUp*******************");
return false;
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
//Log.d("MainActivity", "**************onTouch*******************");
return gestureDetector.onTouchEvent(event);
}
}