安卓之手势检测

1.知识图谱

1.MainActivity代码

package com.example.cookie.android0710gesture; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.widget.ImageView; import android.widget.Toast; import android.widget.ViewFlipper; public class MainActivity extends AppCompatActivity { private ViewFlipper vf_main_image; private int images[]={R.drawable.j1,R.drawable.j8,R.drawable.j3}; private GestureDetector gd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); vf_main_image = (ViewFlipper) findViewById(R.id.vf_main_image); for (int i = 0; i < images.length; i++) { ImageView iv=new ImageView(this); iv.setImageResource(images[i]); vf_main_image.addView(iv); } //实例化手势检测器类 gd = new GestureDetector(this, new GestureDetector.OnGestureListener() { //按下 @Override public boolean onDown(MotionEvent e) { Log.i("test","onDown"); return false; } //按下但是还未松开 @Override public void onShowPress(MotionEvent e) { Log.i("test","onShowPress"); } //轻按 @Override public boolean onSingleTapUp(MotionEvent e) { Log.i("test","onSingleTapUp"); return false; } //滚动 @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { Log.i("test","onScroll"); return false; } //长按 @Override public void onLongPress(MotionEvent e) { Log.i("test","onLongPress"); } //拖动 @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { Log.i("test","onFling"); if (e2.getX()-e1.getX()>200){ Toast.makeText(MainActivity.this, "右滑，上一张", Toast.LENGTH_SHORT).show(); vf_main_image.showPrevious(); //设置动画 //左进右出 vf_main_image.setInAnimation(MainActivity.this,R.anim.left_in); vf_main_image.setOutAnimation(MainActivity.this,R.anim.right_out); } if (e1.getX()-e2.getX()>200){ Toast.makeText(MainActivity.this, "左滑，下一张", Toast.LENGTH_SHORT).show(); vf_main_image.showNext(); //左出右进 vf_main_image.setInAnimation(MainActivity.this,R.anim.right_in); vf_main_image.setOutAnimation(MainActivity.this,R.anim.left_out); } return false; } }); } @Override public boolean onTouchEvent(MotionEvent event) { Log.i("test","onTouchEvent"); return gd.onTouchEvent(event); } }

activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.cookie.android0710gesture.MainActivity"> <ViewFlipper android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/vf_main_image"></ViewFlipper> </LinearLayout> 加动画特效，则要先切换到project然后再res下new一个anim文件夹，新建约束文件

左进left_in.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:fillAfter="true" android:duration="1000"> <translate android:fromXDelta="-100%p" android:toXDelta="0" ></translate> <rotate android:fromDegrees="0" android:toDegrees="360" android:pivotX="50%" android:pivotY="50%" ></rotate> </set> 左出left_out.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:fillAfter="true" android:duration="1000"> <translate android:fromXDelta="0" android:toXDelta="-100%p" ></translate> <rotate android:fromDegrees="0" android:toDegrees="-360" android:pivotX="50%" android:pivotY="50%" ></rotate> </set> 右进rigth_in.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:fillAfter="true" android:duration="1000"> <translate android:fromXDelta="100%p" android:toXDelta="0" ></translate> <rotate android:fromDegrees="0" android:toDegrees="-360" android:pivotX="50%" android:pivotY="50%" ></rotate> </set> 右出right_out.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:fillAfter="true" android:duration="1000"> <translate android:fromXDelta="0" android:toXDelta="100%p" ></translate> <rotate android:fromDegrees="0" android:toDegrees="360" android:pivotX="50%" android:pivotY="50%" ></rotate> </set>