本文实例讲述了Android编程实现网络图片查看器和网页源码查看器。分享给大家供大家参考，具体如下：
网络图片查看器
清单文加入网络访问权限：
<!-- 访问internet权限 --> <uses-permission android:name="android.permission.INTERNET"/>
界面如下：
示例：
public class MainActivity extends Activity {
private EditText imagepath;
private ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imagepath = (EditText) this.findViewById(R.id.imagepath);
imageView = (ImageView) this.findViewById(R.id.imageView);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String path = imagepath.getText().toString();
try{
byte[] data = ImageService.getImage(path);//获取图片数据
if(data!=null){
//构建位图对象
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
imageView.setImageBitmap(bitmap);//显示图片
}else{
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}catch (Exception e) {
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}
});
}
}
public class ImageService {
/**
* 获取图片
* @param path 网络图片路径
* @return 图片的字节数据
*/
public static byte[] getImage(String path) throws Exception{
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//设置超时时间
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode()==200){
InputStream inStream = conn.getInputStream();
byte[] data = StreamTool.read(inStream);
return data;
}
return null;
}
}
public class StreamTool {
/**
* 读取输入流数据
* @param inStream
* @return
*/
public static byte[] read(InputStream inStream) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) != -1 ){
outStream.write(buffer, 0, len);
}
inStream.close();
return outStream.toByteArray();
}
}
网页源码查看器
如果网页的源码超过屏幕的显示位置的话，要求出现滚动条.
<ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/htmlsource" /> </ScrollView>
界面如下：
示例
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pathText = (EditText) this.findViewById(R.id.path);
htmlsource = (TextView) this.findViewById(R.id.htmlsource);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String path = pathText.getText().toString();
try{
//获取源码
String html = PageService.getHtml(path);
htmlsource.setText(html);
}catch (Exception e) {
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}
});
}
public class PageService {
/**
* 获取网页源代码
* @param path 网页路径
* @return
*/
public static String getHtml(String path) throws Exception{
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200){
byte[] data = StreamTool.read(conn.getInputStream());
return new String(data, "UTF-8");
}
return null;
}
}
希望本文所述对大家Android程序设计有所帮助。
