網絡圖片查看器
清單文加入網絡訪問權限:
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|<!– 訪問internet權限 –>
<uses-permission android:name="android.permission.INTERNET"/>
界面如下:
示例:
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<span style="FONT-WEIGHT: normal">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);//獲取圖片數據
if(data!=null){
//構建位圖對象
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
imageView.setImageBitmap(bitmap);//顯示圖片
}else{
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}catch (Exception e) {
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}
});
}
}</span>
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<span style="FONT-WEIGHT: normal">public class ImageService {
/**
* 獲取圖片
* @param path 網絡圖片路徑
* @return 圖片的字節數據
*/
public static byte[] getImage(String path) throws Exception{
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//設置超時時間
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode()==200){
InputStream inStream = conn.getInputStream();
byte[] data = StreamTool.read(inStream);
return data;
}
return null;
}
}</span>
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<span style="FONT-WEIGHT: normal">public class StreamTool {
/**
* 讀取輸入流數據
* @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();
}
}</span>
網頁源碼查看器
如果網頁的源碼超過屏幕的顯示位置的話,要求出現滾動條.
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<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
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@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{
//獲取源碼
String html = PageService.getHtml(path);
htmlsource.setText(html);
}catch (Exception e) {
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}
}
});
}
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public class PageService {
/**
* 獲取網頁源代碼
* @param path 網頁路徑
* @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;
}
}
作者“傅榮康專欄”