ViewFlipper實(shí)現(xiàn)簡單手勢操作

package?com.example.administrator.viewflipper;

import?android.support.v7.app.ActionBarActivity;
import?android.os.Bundle;
import?android.view.Menu;
import?android.view.MenuItem;
import?android.view.MotionEvent;
import?android.view.View;
import?android.widget.ImageView;
import?android.widget.ViewFlipper;


public?class?MainActivity?extends?ActionBarActivity?{
????private?ViewFlipper?viewFlipper;
????private?int[]?resId?=?new?int[]{R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4};

????private?float?startX;
????private?enum?directions{LEFT,RIGHT,NULL};
????private?directions?slip_direction;

????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);

????????viewFlipper?=?(ViewFlipper)findViewById(R.id.flipper);
????????for?(int?i?=?0?;?i?<?resId.length?;?++i){
????????????viewFlipper.addView(getImage(resId[i]));
????????}

????????//自動播放
//????????viewFlipper.setInAnimation(this,R.anim.left_in);
//????????viewFlipper.setOutAnimation(this,?R.anim.left_out);
//????????viewFlipper.setFlipInterval(3000);
//????????viewFlipper.startFlipping();
????}

????/**
?????*?簡單的手勢操作
?????*?@param?event
?????*?@return
?????*/
????@Override
????public?boolean?onTouchEvent(MotionEvent?event)?{
????????switch?(event.getAction()){
????????????case?MotionEvent.ACTION_DOWN:
????????????????startX?=?event.getX();
????????????????slip_direction?=?directions.NULL;
????????????????break;
????????????case?MotionEvent.ACTION_MOVE:
????????????????//向右滑
????????????????if(event.getX()?-?startX?>?100){
????????????????????slip_direction?=?directions.RIGHT;

????????????????}
????????????????//向左滑
????????????????if(startX?-?event.getX()??>?100){
????????????????????slip_direction?=?directions.LEFT;
????????????????}
????????????????break;
????????????case?MotionEvent.ACTION_UP:
????????????????switch?(slip_direction){
????????????????????case?LEFT:
????????????????????????if(viewFlipper.isFlipping()){
????????????????????????????viewFlipper.stopFlipping();
????????????????????????}
????????????????????????viewFlipper.setInAnimation(this,R.anim.right_in);
????????????????????????viewFlipper.setOutAnimation(this,?R.anim.right_out);
????????????????????????viewFlipper.showPrevious();
????????????????????????break;
????????????????????case?RIGHT:
????????????????????????if(viewFlipper.isFlipping()){
????????????????????????????viewFlipper.stopFlipping();
????????????????????????}
????????????????????????viewFlipper.setInAnimation(this,?R.anim.left_in);
????????????????????????viewFlipper.setOutAnimation(this,?R.anim.left_out);
????????????????????????viewFlipper.showNext();
????????????????????????break;
????????????????????case?NULL:
????????????????????????break;
????????????????}
????????????????break;
????????}
????????return?super.onTouchEvent(event);
????}

????private?ImageView?getImage(int?resId){
????????ImageView?img?=?new?ImageView(this);
????????img.setImageResource(resId);
????????return?img;
????}
}