AndroidApp中实现向右滑动销毁功能的要点解析

package com.example.view; 
 
import android.content.Context; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnTouchListener; 
import android.view.ViewConfiguration; 
import android.view.ViewGroup; 
import android.widget.AbsListView; 
import android.widget.RelativeLayout; 
import android.widget.ScrollView; 
import android.widget.Scroller; 
 
/** 
 * 自定义可以滑动的RelativeLayout, 类似于IOS的滑动删除页面效果，当我们要使用 
 * 此功能的时候，需要将该Activity的顶层布局设置为SildingFinishLayout， 
 * 然后需要调用setTouchView()方法来设置需要滑动的View 
 * 
 * @author xiaanming 
 * 
 * @blog http://blog.csdn.net/xiaanming 
 * 
 */ 
public class SildingFinishLayout extends RelativeLayout implements 
    OnTouchListener { 
  /** 
   * SildingFinishLayout布局的父布局 
   */ 
  private ViewGroup mParentView; 
  /** 
   * 处理滑动逻辑的View 
   */ 
  private View touchView; 
  /** 
   * 滑动的最小距离 
   */ 
  private int mTouchSlop; 
  /** 
   * 按下点的X坐标 
   */ 
  private int downX; 
  /** 
   * 按下点的Y坐标 
   */ 
  private int downY; 
  /** 
   * 临时存储X坐标 
   */ 
  private int tempX; 
  /** 
   * 滑动类 
   */ 
  private Scroller mScroller; 
  /** 
   * SildingFinishLayout的宽度 
   */ 
  private int viewWidth; 
  /** 
   * 记录是否正在滑动 
   */ 
  private boolean isSilding; 
   
  private OnSildingFinishListener onSildingFinishListener; 
  private boolean isFinish; 
   
 
  public SildingFinishLayout(Context context, AttributeSet attrs) { 
    this(context, attrs, 0); 
  } 
 
  public SildingFinishLayout(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
 
    mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 
    mScroller = new Scroller(context); 
  } 
 
  @Override 
  protected void onLayout(boolean changed, int l, int t, int r, int b) { 
    super.onLayout(changed, l, t, r, b); 
    if (changed) { 
      // 获取SildingFinishLayout所在布局的父布局 
      mParentView = (ViewGroup) this.getParent(); 
      viewWidth = this.getWidth(); 
    } 
  } 
 
  /** 
   * 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity 
   * 
   * @param onSildingFinishListener 
   */ 
  public void setOnSildingFinishListener( 
      OnSildingFinishListener onSildingFinishListener) { 
    this.OnSildingFinishListener= onSildingFinishListener; 
  } 
 
  /** 
   * 设置Touch的View 
   * 
   * @param touchView 
   */ 
  public void setTouchView(View touchView) { 
    this.touchView = touchView; 
    touchView.setOnTouchListener(this); 
  } 
 
  public View getTouchView() { 
    return touchView; 
  } 
 
  /** 
   * 滚动出界面 
   */ 
  private void scrollRight() { 
    final int delta = (viewWidth + mParentView.getScrollX()); 
    // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item 
    mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0, 
        Math.abs(delta)); 
    postInvalidate(); 
  } 
 
  /** 
   * 滚动到起始位置 
   */ 
  private void scrollOrigin() { 
    int delta = mParentView.getScrollX(); 
    mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0, 
        Math.abs(delta)); 
    postInvalidate(); 
  } 
 
  /** 
   * touch的View是否是AbsListView， 例如ListView, GridView等其子类 
   * 
   * @return 
   */ 
  private boolean isTouchOnAbsListView() { 
    return touchView instanceof AbsListView &＃63; true : false; 
  } 
 
  /** 
   * touch的view是否是ScrollView或者其子类 
   * 
   * @return 
   */ 
  private boolean isTouchOnScrollView() { 
    return touchView instanceof ScrollView &＃63; true : false; 
  } 
 
  @Override 
  public boolean onTouch(View v, MotionEvent event) { 
    switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 
      downX = tempX = (int) event.getRawX(); 
      downY = (int) event.getRawY(); 
      break; 
    case MotionEvent.ACTION_MOVE: 
      int moveX = (int) event.getRawX(); 
      int deltaX = tempX - moveX; 
      tempX = moveX; 
      if (Math.abs(moveX - downX) > mTouchSlop 
          && Math.abs((int) event.getRawY() - downY) = 0 && isSilding) { 
        mParentView.scrollBy(deltaX, 0); 
 
        // 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件 
        if (isTouchOnScrollView() || isTouchOnAbsListView()) { 
          return true; 
        } 
      } 
      break; 
    case MotionEvent.ACTION_UP: 
      isSilding = false; 
      if (mParentView.getScrollX() <= -viewWidth / 2) { 
        isFinish = true; 
        scrollRight(); 
      } else { 
        scrollOrigin(); 
        isFinish = false; 
      } 
      break; 
    } 
 
    // 假如touch的view是AbsListView或者ScrollView 我们处理完上面自己的逻辑之后 
    // 再交给AbsListView, ScrollView自己处理其自己的逻辑 
    if (isTouchOnScrollView() || isTouchOnAbsListView()) { 
      return v.onTouchEvent(event); 
    } 
 
    // 其他的情况直接返回true 
    return true; 
  } 
 
  @Override 
  public void computeScroll() { 
    // 调用startScroll的时候scroller.computeScrollOffset()返回true， 
    if (mScroller.computeScrollOffset()) { 
      mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); 
      postInvalidate(); 
 
      if (mScroller.isFinished()) { 
 
        if (onSildingFinishListener != null && isFinish) { 
          onSildingFinishListener.onSildingFinish(); 
        } 
      } 
    } 
  } 
   
 
  public interface OnSildingFinishListener { 
    public void onSildingFinish(); 
  } 
 
} 

package com.example.slidingfinish; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.Window; 
import android.widget.Button; 
 
import com.example.slidingfinish.R; 
 
public class MainActivity extends Activity implements OnClickListener { 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
 
    Button mButtOnNormal= (Button) findViewById(R.id.normal_activity); 
    mButtonNormal.setOnClickListener(this); 
 
    Button mButtOnAbs= (Button) findViewById(R.id.absListview_activity); 
    mButtonAbs.setOnClickListener(this); 
 
    Button mButtOnScroll= (Button) findViewById(R.id.scrollview_activity); 
    mButtonScroll.setOnClickListener(this); 
 
  } 
 
  @Override 
  public void onClick(View v) { 
    Intent mIntent = null; 
    switch (v.getId()) { 
    case R.id.normal_activity: 
      mIntent = new Intent(MainActivity.this, NormalActivity.class); 
      break; 
    case R.id.absListview_activity: 
      mIntent = new Intent(MainActivity.this, AbsActivity.class); 
      break; 
    case R.id.scrollview_activity: 
      mIntent = new Intent(MainActivity.this, ScrollActivity.class); 
      break; 
    } 
 
    startActivity(mIntent); 
    overridePendingTransition(R.anim.base_slide_right_in, R.anim.base_slide_remain); 
  } 
   
  //Press the back button in mobile phone 
  @Override 
  public void onBackPressed() { 
    super.onBackPressed(); 
    overridePendingTransition(0, R.anim.base_slide_right_out); 
  } 
 
} 

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;> 
 
 
   
   
   
   
 

package com.example.slidingfinish; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
 
import com.example.slidingfinish.R; 
import com.example.view.SildingFinishLayout; 
import com.example.view.SildingFinishLayout.OnSildingFinishListener; 
 
public class AbsActivity extends Activity { 
  private List list = new ArrayList(); 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_abslistview); 
 
    for (int i = 0; i <= 30; i++) { 
      list.add("测试数据" + i); 
    } 
 
    ListView mListView = (ListView) findViewById(R.id.listView); 
    ArrayAdapter adapter = new ArrayAdapter( 
        AbsActivity.this, android.R.layout.simple_list_item_1, list); 
    mListView.setAdapter(adapter); 
 
    SildingFinishLayout mSildingFinishLayout = (SildingFinishLayout) findViewById(R.id.sildingFinishLayout); 
    mSildingFinishLayout 
        .setOnSildingFinishListener(new OnSildingFinishListener() { 
 
          @Override 
          public void onSildingFinish() { 
            AbsActivity.this.finish(); 
          } 
        }); 
 
    // touchView要设置到ListView上面 
    mSildingFinishLayout.setTouchView(mListView); 
 
    mListView.setOnItemClickListener(new OnItemClickListener() { 
 
      @Override 
      public void onItemClick(AdapterView<&＃63;> parent, View view, 
          int position, long id) { 
 
        startActivity(new Intent(AbsActivity.this, NormalActivity.class)); 
        overridePendingTransition(R.anim.base_slide_right_in, 
            R.anim.base_slide_remain); 
      } 
    }); 
  } 
 
  // Press the back button in mobile phone 
  @Override 
  public void onBackPressed() { 
    super.onBackPressed(); 
    overridePendingTransition(0, R.anim.base_slide_right_out); 
  } 
 
}