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實現QQ iPad客戶端的對話框平滑移動的效果

今天要寫一個Android對話框，實現對話框隨著手指能夠移動，而且當對話框移動到一定程度的時候，能夠實現對話框在左右自動隱藏。這個功能比較難，需要系統的學習一下onTouch函數，現在貼出我的源代碼：

package com.yelbosh.test;

import java.io.IOException;

import com.yelbosh.test.classes.MyButton;

import android.Manifest;
import android.opengl.Visibility;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.text.Layout;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.support.v4.app.NavUtils;
import android.webkit.*;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

/**
*
* @author yelbosh
* 2012-7-15
*/
public class MainActivity extends Activity {
private static final boolean LEFT = true;
private static final boolean RIGHT = false;

private View talkdiv;
private Button photo;
private RelativeLayout rl;
//talkdiv上面的title
private TextView titleBar;
//設置talkidv出現的方向
private boolean talkOrentation = LEFT;

private int WINDOW_HEIGHT;
private int WINDOW_WIDTH;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rl = (RelativeLayout)findViewById(R.id.mainlayout);
        photo = (Button)findViewById(R.id.myphoto);
        talkdiv = getLayoutInflater().inflate(R.layout.talk, rl,false);
        rl.addView(talkdiv);
        talkdiv.setVisibility(View.INVISIBLE);

        titleBar = (TextView)findViewById(R.id.titleBar);

        //為titleBar設置監聽函數
        titleBar.setOnTouchListener(new View.OnTouchListener() {
//記錄初始位置
        int temp;
        int viewLeft;

public boolean onTouch(View arg0, MotionEvent event) {
// TODO Auto-generated method stub
int eventaction = event.getAction();
int x = (int)event.getRawX();

switch (eventaction) {
case MotionEvent.ACTION_DOWN:
temp = (int) event.getRawX();//記錄起始x坐標
viewLeft = (int)MainActivity.this.talkdiv.getLeft();
break;
case MotionEvent.ACTION_MOVE:
MainActivity.this.talkdiv.layout(viewLeft+x-temp, 0, viewLeft+x-temp+MainActivity.this.talkdiv.getWidth(), MainActivity.this.talkdiv.getHeight());
MainActivity.this.talkdiv.postInvalidate();
break;
case MotionEvent.ACTION_UP:
//根據滑動的距離進行判斷
//滑到右邊
if((viewLeft + x-temp) > 0.3*MainActivity.this.WINDOW_WIDTH){

//滑向右邊
Animation temani = new TranslateAnimation(MainActivity.this.talkdiv.getLeft(),MainActivity.this.talkdiv.getWidth(),0,0);
temani.setDuration(600);
MainActivity.this.talkdiv.startAnimation(temani);
MainActivity.this.talkdiv.setVisibility(View.INVISIBLE);
//使其居中
MainActivity.this.talkdiv.layout(0, 0,MainActivity.this.talkdiv.getWidth(), MainActivity.this.talkdiv.getHeight());
//設置下次從右邊出現
MainActivity.this.talkOrentation = MainActivity.this.RIGHT;
}else if((viewLeft + x-temp) < -0.3*MainActivity.this.WINDOW_WIDTH){
//滑向左邊
Animation temani = new TranslateAnimation(viewLeft + x-temp,-MainActivity.this.talkdiv.getWidth(),0,0);
temani.setDuration(600);
MainActivity.this.talkdiv.startAnimation(temani);
MainActivity.this.talkdiv.setVisibility(View.INVISIBLE);
MainActivity.this.talkdiv.layout(0, 0,MainActivity.this.talkdiv.getWidth(), MainActivity.this.talkdiv.getHeight());
//設置下次從左邊出現
MainActivity.this.talkOrentation = MainActivity.this.LEFT;
}else{
//保持在（0，0）
Animation temani = new TranslateAnimation(viewLeft + x-temp,0,0,0);
temani.setDuration(600);
MainActivity.this.talkdiv.startAnimation(temani);
//使其居中
MainActivity.this.talkdiv.layout(0, 0,MainActivity.this.talkdiv.getWidth(), MainActivity.this.talkdiv.getHeight());
//重繪至中間
MainActivity.this.talkdiv.postInvalidate();
}
break;
}
return true;
}
});


        WINDOW_HEIGHT = this.getWindowManager().getDefaultDisplay().getHeight();
        WINDOW_WIDTH = this.getWindowManager().getDefaultDisplay().getHeight();
        /**
         * 為按鈕設置監聽函數
         */
        photo.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
//只有當其不可見的時候我們才執行動畫
if(talkdiv.getVisibility() == View.INVISIBLE){
talkdiv.setVisibility(View.VISIBLE);
//判斷應該從哪個方向拉出
int temx = MainActivity.this.talkOrentation?-MainActivity.this.talkdiv.getWidth():MainActivity.this.talkdiv.getWidth();
Animation translate = new TranslateAnimation(Animation.RELATIVE_TO_SELF,temx,Animation.RELATIVE_TO_PARENT,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0);
translate.setDuration(200);
MainActivity.this.talkdiv.startAnimation(translate);
}
}
});


        //rl.addView(talkdiv);

    }
@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }