Android传递Bitmap对象在两个Activity之间

易采站长站为您分析Android传递Bitmap对象在两个Activity之间的相关资料,需要的朋友可以参考下  

通过内部存储方式实现了在两个Activity之间传递Bitmap对象以及其它支持串行化的Java对象，关键点有如下：

1．  HTTP客户端下载图片，通过ImageView对象显示

2．  把ImageView上的Bitmap对象从当前Activity传递到另外一个Activity中并显示出来

3．  基于串行化传递Java对象数据

首先看我是怎么实现HTTP客户端下载图片，通过异步Task接口实现HTTP客户端下载图片并通过Handler来更新ImageView，代码如下：

package com.example.sharedemo; 
 
import java.io.IOException; 
import java.io.InputStream; 
 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.AsyncTask; 
import android.os.Handler; 
import android.os.Message; 
import android.util.Log; 
 
public class ImageLoadTask extends AsyncTask<String, Void, Bitmap> { 
  private Handler handler; 
 
  public ImageLoadTask(Handler handler) { 
    this.handler = handler; 
  } 
 
  protected void onPostExecute(Bitmap bitmap) { 
    Message msg = new Message(); 
    msg.obj = bitmap; 
    handler.sendMessage(msg); 
  } 
 
  @Override 
  protected Bitmap doInBackground(String... urls) { 
    Bitmap bitmap = null; 
    // create HTTP client 
    HttpClient httpclient = new DefaultHttpClient(); 
    try { 
      // GET request 
      Log.i("image-url", urls[0]); 
      HttpGet httpRequest = new HttpGet(urls[0]); 
      HttpResponse httpResponse = httpclient.execute(httpRequest); 
      if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
        // get entity from response 
        HttpEntity httpEntity = httpResponse.getEntity(); 
        // read stream 
        InputStream is = httpEntity.getContent(); 
        bitmap = BitmapFactory.decodeStream(is); 
        is.close(); 
        Log.i("image", "already get the image by url : " + urls[0]); 
      } 
 
    } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } finally { 
      httpclient.getConnectionManager().shutdown(); 
    } 
    return bitmap; 
  } 
 
} 
								 
 1/4    1 2 3 4 下一页 尾页