要实现滑屏等触发事件,视情况而定;
如果实现的触屏或者手势效果较多,则使用第一种方法,实现OnGestureListener 接口(参考OnGestureListener);
如果只是实现较少的效果,则考虑使用SimpleOnGestureListener(参考SimpleOnGestureListenter);主要分为以下三步:
第一种方法:
1、继承OnTouchListener , OnGestureListener ;
//继承OnTouchListener,OnGestureListener public class MainActivity extends Activity implements OnTouchListener,OnGestureListener{
注:此处使用的OnGestureListener来自包 android.view.GestureDetector.OnGestureListener;而不是 android.gesture.GestureOverlayView.OnGestureListener;
2、初始化OnGestureListener ,即注册手势监听 ;获得当前接受操作的布局id ; 注册触屏监听;
//手势监听 mGestureDetector = new GestureDetector(MainActivity.this,(OnGestureListener) this);//(OnGestureListener) 可以省略 //获得当前接受操作的布局id RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity); //触屏监听 mActivity.setOnTouchListener(this); mActivity.setLongClickable(true);
3、重载onFling()和onTouch();
public boolean onTouch(View v, MotionEvent event) { return mGestureDetector.onTouchEvent(event); } public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //省略 }
第二种方法如下:
1、继承OnTouchListener ;
//继承OnTouchListener public class MainActivity extends Activity implements OnTouchListener{
2、初始化OnGestureListener ,即注册手势监听 ;获得当前接受操作的布局id ; 注册触屏监听;
//手势监听 mGestureDetector = new GestureDetector(MainActivity.this,new MySimpleOnGestureListener());//下边定义MySimpleOnGestureListener, //并使其继承SimpleOnGestureListener类 //获得当前接受操作的布局id RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity); //触屏监听 mActivity.setOnTouchListener(this); mActivity.setLongClickable(true);
3、定义SimpleOnGestureListener子类,并重载onTouch()和所需方法;
class MySimpleGestureListener extends SimpleOnGestureListener{ @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度,则执行相应方法 if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show(); }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show(); }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show(); }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show(); } return false; } @Override public boolean onDown(MotionEvent e){ Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show(); return false; } }
具体代码如下:
(第一种方法)
import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.GestureDetector; import android.view.GestureDetector.OnGestureListener; import android.view.GestureDetector.SimpleOnGestureListener; import android.view.Menu; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.*; public class MainActivity extends Activity implements OnTouchListener,OnGestureListener{ private static final String tag = "mainActivity"; private GestureDetector mGestureDetector; private int verticalMinistance = 20; //水平最小识别距离 private int minVelocity = 10; //最小识别速度 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //手势监听 mGestureDetector = new GestureDetector(MainActivity.this,(OnGestureListener) this);//(OnGestureListener) 可以省略 //获得当前接受操作的布局id RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity); //触屏监听 mActivity.setOnTouchListener(this); mActivity.setLongClickable(true); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onTouch(View v, MotionEvent event) { return mGestureDetector.onTouchEvent(event); } public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度,则执行相应方法 if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ //在此处实现跳转 //Intent intent = new Intent(MainActivity.this,nextActivity.class); //startActivity(intent); Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show(); }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show(); }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show(); }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show(); } return false; } //只要有触发就会调用次方法 @Override public boolean onDown(MotionEvent e) { Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show(); return false; } @Override public void onLongPress(MotionEvent e) { Toast.makeText(MainActivity.this, "onLongPress", Toast.LENGTH_SHORT).show(); } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // Toast.makeText(MainActivity.this, "onScroll", Toast.LENGTH_SHORT).show(); return false; } @Override public void onShowPress(MotionEvent e) { // Toast.makeText(MainActivity.this, "onShowPress", Toast.LENGTH_SHORT).show(); } @Override public boolean onSingleTapUp(MotionEvent e) { // Toast.makeText(MainActivity.this, "onsingleTapup", Toast.LENGTH_SHORT).show(); return false; } }
(第二种方法)
import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.GestureDetector; import android.view.GestureDetector.OnGestureListener; import android.view.GestureDetector.SimpleOnGestureListener; import android.view.Menu; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.*; public class MainActivity extends Activity implements OnTouchListener{ private static final String tag = "mainActivity"; private GestureDetector mGestureDetector; private int verticalMinistance = 20; //水平最小识别距离 private int minVelocity = 10; //最小识别速度 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //手势监听 mGestureDetector = new GestureDetector(MainActivity.this,new LearnGestureListener()); //获得当前接受操作的布局id RelativeLayout mActivity = (RelativeLayout)findViewById(R.id.main_activity); //触屏监听 mActivity.setOnTouchListener(this); mActivity.setLongClickable(true); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onTouch(View v, MotionEvent event) { return mGestureDetector.onTouchEvent(event); } class LearnGestureListener extends SimpleOnGestureListener{ @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //大于设定的最小滑动距离并且在水平/竖直方向速度绝对值大于设定的最小速度,则执行相应方法 if(e1.getX()-e2.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ Toast.makeText(MainActivity.this, "turn left", Toast.LENGTH_SHORT).show(); }else if(e2.getX() - e1.getX() > verticalMinistance && Math.abs(velocityX) > minVelocity){ Toast.makeText(MainActivity.this, "turn right", Toast.LENGTH_SHORT).show(); }else if(e1.getY()-e2.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn up", Toast.LENGTH_SHORT).show(); }else if(e2.getY()-e1.getY() > 20 && Math.abs(velocityY) > 10){ Toast.makeText(MainActivity.this, "turn down", Toast.LENGTH_SHORT).show(); } return false; } @Override public boolean onDown(MotionEvent e){ Toast.makeText(MainActivity.this, "onDown", Toast.LENGTH_SHORT).show(); return false; } } }