ontouchevent与手势

转载于 2011-12-06 15:05:05 发布 · 295 阅读

文章标签：

#button #exception #float #interface #distance #class

本文详细介绍了在Android应用开发中如何处理控件的触摸事件与手势识别，通过重写Activity的onTouchEvent方法实现按钮、网格视图、面板抽屉等组件的全面响应。包括自定义面板抽屉组件的实现，通过手势控制组件的展开与收起，以及事件分发策略的优化。

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package com.test.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView.ScaleType;

public class TTTTTActivity extends Activity {

private GridView gridview;
private LinearLayout rl;
private PanelDrawer drawer;
@Override
protected void onCreate(Bundle icicle) {

  super.onCreate(icicle);
  setContentView(R.layout.main);

  init();
}

private void init(){
  rl = (LinearLayout)findViewById(R.id.rl);
  gridview = (GridView)findViewById(R.id.gridview);
  gridview.setAdapter(adapter);
  gridview.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    // TODO Auto-generated method stub
    Toast.makeText(getBaseContext(), "" + arg2, Toast.LENGTH_LONG).show();
   }
  });

  drawer = new PanelDrawer(getBaseContext(), gridview, 160, 480);
  rl.addView(drawer);
}

private BaseAdapter adapter = new BaseAdapter() {

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   // TODO Auto-generated method stub
   ImageView iv = new ImageView(getBaseContext());
   iv.setImageResource(R.drawable.icon);
   iv.setScaleType(ScaleType.CENTER_INSIDE);
   return iv;
  }

  @Override
  public long getItemId(int position) {
   // TODO Auto-generated method stub
   return 0;
  }

  @Override
  public Object getItem(int position) {
   // TODO Auto-generated method stub
   return null;
  }

  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return 50;
  }
};

public boolean onTouchEvent(MotionEvent event) {
  return drawer.onTouchEvent(event);
};
}

上面是activity

package com.test.android;

import android.content.Context;
import android.graphics.Color;
import android.os.AsyncTask;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class PanelDrawer extends LinearLayout implements GestureDetector.OnGestureListener {

private static final int STEP_WIDTH = 20;
private static final int BUTTON_WIDTH = 20;
private int width;
private int height;
private int rightmargin;
private OnOpenListener openlistener;
private OnCloseListener closelistener;
private LinearLayout container;
private GestureDetector detector;

public PanelDrawer(Context context,View view,int width,int height){
  super(context);
  this.width = width;
  this.height = height;

  init(context,view);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
  // TODO Auto-generated method stub
  return detector.onTouchEvent(event);
}

private void init(Context context,View view){
  this.setFocusableInTouchMode(false);
  detector = new GestureDetector(this);
  detector.setIsLongpressEnabled(true);
  // gridview设置可以进行压缩
  LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)view.getLayoutParams();
  lp.weight = 1;
  view.setLayoutParams(lp);

  LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(this.width, this.height);
  this.setOrientation(LinearLayout.HORIZONTAL);
  params.rightMargin = -this.width + BUTTON_WIDTH;
  this.rightmargin = params.rightMargin;
  this.setLayoutParams(params);

  Button bar = new Button(context);
  bar.setFocusableInTouchMode(false);
  LinearLayout.LayoutParams barparams = new LinearLayout.LayoutParams(BUTTON_WIDTH, this.height);
  bar.setBackgroundColor(Color.BLUE);
  this.addView(bar,barparams);

  container = new LinearLayout(context);
  LinearLayout.LayoutParams containerparams = new LinearLayout.LayoutParams(width - BUTTON_WIDTH, LinearLayout.LayoutParams.FILL_PARENT);
//  containerparams.width = 1;
  container.setLayoutParams(containerparams);
  container.setBackgroundColor(Color.RED);
  this.addView(container);

  bar.setOnTouchListener(new OnTouchListener() {

   @Override
   public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    return detector.onTouchEvent(event);
   }
  });

}

private int distance;

private class AsyMoveDrawable extends AsyncTask<String, Integer, String>{

  @Override
  protected String doInBackground(String... params) {
   // TODO Auto-generated method stub
   String move = params[0];
   if(move.toString().trim().toLowerCase().toString().equals("open")){
    while(rightmargin < 0){
     rightmargin += STEP_WIDTH;
     if(rightmargin > 0){
      rightmargin = 0;
     }
     publishProgress(rightmargin);
     try {
      Thread.sleep(500);
     } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
     }
    }
   } else {
    while(rightmargin > (-width + BUTTON_WIDTH)){
     rightmargin -= STEP_WIDTH;
     if(rightmargin < (-width + BUTTON_WIDTH)){
      rightmargin = (-width + BUTTON_WIDTH);
     }
     publishProgress(rightmargin);
     try {
      Thread.sleep(500);
     } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
     }
    }
   }
   return null;
  }

  @Override
  protected void onProgressUpdate(Integer... values) {
   // TODO Auto-generated method stub
   super.onProgressUpdate(values);
   int current = values[0];
   LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)PanelDrawer.this.getLayoutParams();
   params.rightMargin = current;
   PanelDrawer.this.setLayoutParams(params);
   rightmargin = current;
//   container.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
  }
};

public interface OnOpenListener{
  public void onOpen();
}

public interface OnCloseListener{
  public void onClose();
}

public void addContainerView(View view){
  container.addView(view);
}

@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
   float velocityY) {
  // TODO Auto-generated method stub
  return false;
}

@Override
public void onLongPress(MotionEvent e) {
// TODO Auto-generated method stub

}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
   float distanceY) {
  // TODO Auto-generated method stub
  Toast.makeText(getContext(), "containeer", Toast.LENGTH_LONG).show();
  distance += distanceX;
  // 向左滑动
  if(rightmargin < 0 && distanceX > 0){
   LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)container.getLayoutParams();
   rightmargin += distanceX;
   params.rightMargin = rightmargin;
   if(rightmargin > 0){
    rightmargin = 0;
    params.rightMargin = 0;
   }
   PanelDrawer.this.setLayoutParams(params);
   if(rightmargin == 0){
    if(openlistener != null){
     openlistener.onOpen();
    }
   }
  } else {

  }
  return false;
}