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给出一张图片的网址,我们怎么把这张图片加载到我们的ImageView控件显示呢?
由于采用网络请求,我们必须在AndroidManifest.xml添加权限<uses-permission android:name="android.permission.INTERNET"/>
由于是网络请求数据,我们必须在开辟一条线程来完成数据请求,得到数据后最终回到主线程刷新UI显示图片即可。
好了,该说的已经说了,下面直接贴代码了。
1、MainActivity.java
import java.io.IOException;
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 org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;
public class MainActivity extends Activity {
private ImageView imageView;
private final String PATH = "https://www.baidu.com/img/bdlogo.png";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView1);
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(PATH);
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
byte[] data = EntityUtils.toByteArray(httpResponse
.getEntity());
Message message = Message.obtain();
message.obj = data;
message.what = RESULT_OK;
handler.sendMessage(message);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (httpClient != null
&& httpClient.getConnectionManager() != null) {
httpClient.getConnectionManager().shutdown();
}
}
}
}).start();
}
public Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == RESULT_OK) {
byte[] data = (byte[]) msg.obj;
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
data.length);
imageView.setImageBitmap(bitmap);
}
};
};
}
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
3、AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.de"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.de.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>