Because the sliding effect of the page is commonly used in the entire application, all are extracted into parent classes for introduction. See the code comments
import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.GestureDetector.SimpleOnGestureListener;import android.widget.Toast;//定义抽象方法showNext,由基类根据需要实现,其注意功能就是滑动切换,可以按123步骤学习public abstract class BaseSetupActivity extends Activity { //1.定义一个手势识别器 private GestureDetector detector; protected SharedPreferences sp; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); sp = getSharedPreferences("config", MODE_PRIVATE); //2.实例化这个手势识别器,GestureDetector.SimpleOnGestureListener需要单独引用 detector = new GestureDetector(this, new SimpleOnGestureListener(){ /** * 当我们的手指在上面滑动的时候回调 */ @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //屏蔽在X滑动很慢的情形 if(Math.abs(velocityX)<300){ Toast.makeText(getApplicationContext(), "滑动得太慢了", 0).show(); return true; } //屏蔽斜滑这种情况 if(Math.abs((e2.getRawY() - e1.getRawY())) > 100){ Toast.makeText(getApplicationContext(), "不能这样滑", 0).show(); return true; } if((e2.getRawX() - e1.getRawX())> 200 ){ //显示上一个页面:从左往右滑动 System.out.println("显示上一个页面:从左往右滑动"); showPre(); return true; } if((e1.getRawX()-e2.getRawX()) > 200 ){ //显示下一个页面:从右往左滑动 System.out.println("显示下一个页面:从右往左滑动"); showNext(); return true; } return super.onFling(e1, e2, velocityX, velocityY); } }); } public abstract void showNext(); public abstract void showPre(); /** * 下一步的点击事件 * @param view */ public void next(View view){ showNext(); } /** * 上一步 * @param view */ public void pre(View view){ showPre(); } //3.使用手势识别器 @Override public boolean onTouchEvent(MotionEvent event) { detector.onTouchEvent(event); return super.onTouchEvent(event); }}