自定义TextView和异步加载图片的实现(2)

源代码：ConstomTextView.java

package com.wwj.textView;

import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

import Android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.text.Html;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ConstomTextView extends LinearLayout{

//上下文对象
 private Context mContext;
 //声明TypedArray的引用
 private TypedArray mTypedArray;
 //布局参数
 private LayoutParams params;
 
 public ConstomTextView(Context context) {
  super(context);
 }
 
 public ConstomTextView(Context context, AttributeSet attrs) {
  super(context, attrs);
  this.mContext = context;
  this.setOrientation(LinearLayout.VERTICAL);
  //从attrs.xml文件中那个获取自定义属性
  mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.constomTextView);
 }
 
 public void setText(ArrayList<HashMap<String, String>> datas) {
  //遍历ArrayList
  for(HashMap<String, String> hashMap : datas) {
   //获取key为"type"的值
   String type = hashMap.get("type");
   //如果value=imaeg
   if(type.equals("image")){
    //获取自定义属性属性
    int imagewidth = mTypedArray.getDimensionPixelOffset(R.styleable.constomTextView_image_width, 100);
    int imageheight = mTypedArray.getDimensionPixelOffset(R.styleable.constomTextView_image_height, 100);
    ImageView imageView = new ImageView(mContext);
    params = new LayoutParams(imagewidth, imageheight);
    params.gravity = Gravity.CENTER_HORIZONTAL; //居中
    imageView.setLayoutParams(params);
    //显示图片
    imageView.setImageResource(R.drawable.ic_constom);
    //将imageView添加到LinearLayout当中
    addView(imageView);
    //启动异步线程更新异步显示图片信息
    new DownloadPicThread(imageView, hashMap.get("value")).start();
   }
   else {
    float textSize = mTypedArray.getDimension(R.styleable.constomTextView_textSize, 16);
    int textColor = mTypedArray.getColor(R.styleable.constomTextView_textColor, 0xFF0000FF);
    TextView textView = new TextView(mContext);
    textView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
    textView.setText(Html.fromHtml(hashMap.get("value")));
    textView.setTextSize(textSize);  //设置字体大小
    textView.setTextColor(textColor); //设置字体颜色
    addView(textView);
   }
  }
 }
 
 private Handler handler = new Handler() {
  public void handleMessage(android.os.Message msg) {
   @SuppressWarnings("unchecked")
   HashMap<String, Object> hashMap = (HashMap<String, Object>) msg.obj;
   ImageView imageView = (ImageView) hashMap.get("imageView");
   LayoutParams params = new LayoutParams(msg.arg1, msg.arg2);
   params.gravity = Gravity.CENTER_HORIZONTAL; //居中
   imageView.setLayoutParams(params);
   Drawable drawable = (Drawable) hashMap.get("drawable");
   imageView.setImageDrawable(drawable);  //显示图片
  };
 };
 
 /**
  * 定义一个线程类，异步加载图片
  * @author Administrator
  *
  */
 private class DownloadPicThread extends Thread {
  private ImageView imageView;
  private String mUrl;
 
 
  public DownloadPicThread(ImageView imageView, String mUrl) {
   super();
   this.imageView = imageView;
   this.mUrl = mUrl;
  }

  @Override
  public void run() {
   // TODO Auto-generated method stub
   Drawable drawable = null;
   int newImgWidth = 0;
   int newImgHeight = 0;
   try {
    drawable = Drawable.createFromStream(new URL(mUrl).openStream(), "image");
    //对图片进行缩放
    newImgWidth = drawable.getIntrinsicWidth() / 3;
    newImgHeight = drawable.getIntrinsicHeight() / 3;
   } catch (Exception e) {
    // TODO: handle exception
    e.printStackTrace();
   }
   //让线程休眠2秒
   SystemClock.sleep(2000);
   //使用Handler更新UI
   Message msg = handler.obtainMessage();
   HashMap<String, Object> hashMap = new HashMap<String, Object>();
   hashMap.put("imageView", imageView);
   hashMap.put("drawable", drawable);
   msg.obj = hashMap;
   msg.arg1 = newImgWidth;
   msg.arg2 = newImgHeight;
   handler.sendMessage(msg);
  }
 }

}