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Android使用ImageView显示网络图片
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本案例使用ImageView 簡單的實現了網絡圖片的調用。當中注意事項。由于用到了網絡，這里採用了HttpClient方法訪問網絡聯接，關于怎樣使用，可參照文章?Android中使用HttpClient實現HTTP通信效果?，因此。須要注意配置網絡權限問題。以及須要使用新線程及Handler來更新Activity，不然會直接報錯Not Main Thread 看實例： MainActivity.java package com.example.imageview;import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.graphics.Bitmap;
import android.view.Menu;
import android.widget.ImageView;public class MainActivity extends Activity {
private Bitmap bm = null;@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);final Handler handler = new Handler();
new Thread() {
public void run() {
bm = new ApacheHttpClient()
.getHttpBmp("http://www.qilujiaju.com/data/attachment/block/c9/c960ba426890a8ddbfc35d2b4b0d97c9.jpg");
handler.post(new Runnable() {@Override
public void run() {
// TODO Auto-generated method stub
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
imageView.setImageBitmap(bm);
}
});
}
}.start();
}@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}}
ApacheHttpClient.java package com.example.imageview;import java.io.IOException;
import java.io.InputStream;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.util.Log;public class ApacheHttpClient {
private static final String TAG = "Error";public InputStream httpGet(String url) {
InputStream result = null;
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
int httpStatus = httpResponse.getStatusLine().getStatusCode();
if (httpStatus == HttpStatus.SC_OK) {
InputStream in = httpResponse.getEntity().getContent();
try {
result = in;
} catch (Exception e) {
Log.i(TAG, "Exception");
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
result = null;
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i(TAG, "ClientProtocolException");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i(TAG, "ClientProtocolException");
}
return result;
}public Bitmap getHttpBmp(String url) {
Bitmap bm = null;
InputStream is = httpGet(url);
bm = BitmapFactory.decodeStream(is);
return bm;
}
}
AndroidMainFest.xml <?
xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.imageview" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /> <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.imageview.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>
activity_main.xml <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=".MainActivity" ><ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@drawable/app" /></RelativeLayout>
這是一個完整的實例，可直接執行于模擬器或真機。
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