Android实现加载网络端图片

要获取网络上的图片，首先得有网络的访问权限，需要在AndroidManifest中添加相应权限，效果图：

布局文件如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${packageName}.${activityClass}" >

    <ImageView
        android:id="@+id/iv_img"
        android:layout_width="wrap_content"
        android:layout_height="300dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/ic_launcher" />

    <EditText
        android:id="@+id/et_url"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="60dp"
        android:inputType="textUri"
        android:text="@string/et_url"/>

    <Button
        android:id="@+id/btn_img"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:onClick="sendGetImg"
        android:text="@string/btn_img" />

</RelativeLayout>

功能代码：

import org.apache.http.Header;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;

public class MainActivity extends Activity {

	private EditText et_url;
	private ImageView iv_img;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_url=(EditText) findViewById(R.id.et_url);
		iv_img=(ImageView) findViewById(R.id.iv_img);
	}

	public void sendGetImg(View v){
		int id=v.getId();
		switch(id){
		case R.id.btn_img:
			//获取网络路径
			String url=et_url.getText().toString();
			//创建客户端对象
			AsyncHttpClient client=new AsyncHttpClient();
			client.get(url, new AsyncHttpResponseHandler(){
				@Override
				public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
					if(statusCode==200){
						BitmapFactory factory=new BitmapFactory();
						Bitmap bitmap=factory.decodeByteArray(responseBody, 0, responseBody.length);
						iv_img.setImageBitmap(bitmap);
					}
				}

				@Override
				public void onFailure(int statusCode, Header[] headers,
						byte[] responseBody, Throwable error) {
					error.printStackTrace();
				}
			});
			break;
		default:
			break;
		}
	}
}

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