public class MainActivity extends Activity implements OnClickListener {
private static final String TAG = "MainActivity";
protected static final int ERROR = 1;
private EditText etUrl;
private ImageView ivIcon;
private final int SUCCESS = 0;
private Handler handler = new Handler() {
/**
* 接收消息
*/
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.i(TAG, "what = " + msg.what);
if(msg.what == SUCCESS) { // 当前是访问网络, 去显示图片
ivIcon.setImageBitmap((Bitmap) msg.obj); // 设置imageView显示的图片
} else if(msg.what == ERROR) {
Toast.makeText(MainActivity.this, "抓去失败", 0).show();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ivIcon = (ImageView) findViewById(R.id.iv_icon);
etUrl = (EditText) findViewById(R.id.et_url);
findViewById(R.id.btn_submit).setOnClickListener(this);
}
@Override
public void onClick(View v) {
final String url = etUrl.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
Bitmap bitmap = getImageFromNet(url);
// ivIcon.setImageBitmap(bitmap); // 设置imageView显示的图片
if(bitmap != null) {
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = bitmap;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}}).start();
}
/**
* 根据url连接取网络抓去图片返回
* @param url
* @return url对应的图片
*/
private Bitmap getImageFromNet(String url) {
HttpURLConnection conn = null;
try {
URL mURL = new URL(url); // 创建一个url对象
// 得到http的连接对象
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET"); // 设置请求方法为Get
conn.setConnectTimeout(10000); // 设置连接服务器的超时时间, 如果超过10秒钟, 没有连接成功, 会抛异常
conn.setReadTimeout(5000); // 设置读取数据时超时时间, 如果超过5秒, 抛异常
conn.connect(); // 开始链接
int responseCode = conn.getResponseCode(); // 得到服务器的响应码
if(responseCode == 200) {
// 访问成功
InputStream is = conn.getInputStream(); // 获得服务器返回的流数据
Bitmap bitmap = BitmapFactory.decodeStream(is); // 根据 流数据 创建一个bitmap位图对象
return bitmap;
} else {
Log.i(TAG, "访问失败: responseCode = " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(conn != null) {
conn.disconnect(); // 断开连接
}
}
return null;
}
}
public class MainActivity2 extends Activity implements OnClickListener {
private EditText etUrl;
private SmartImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
etUrl = (EditText) findViewById(R.id.et_url);
mImageView = (SmartImageView) findViewById(R.id.iv_icon);
findViewById(R.id.btn_submit).setOnClickListener(this);
}
@Override
public void onClick(View v) {
// 1. 取出url, 抓取图片
String url = etUrl.getText().toString();
mImageView.setImageUrl(url);
}
}
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private static final int SUCCESS = 0;
protected static final int ERROR = 1;
private EditText etUrl;
private TextView tvHtml;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SUCCESS:
tvHtml.setText((String) msg.obj);
break;
case ERROR:
Toast.makeText(MainActivity.this, "访问失败", 0).show();
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etUrl = (EditText) findViewById(R.id.et_url);
tvHtml = (TextView) findViewById(R.id.tv_html);
}
public void getHtml(View v) {
final String url = etUrl.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
// 请求网络
String html = getHtmlFromInternet(url);
if(!TextUtils.isEmpty(html)) {
// 更新textview的显示了
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = html;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}
}).start();
}
/**
* 根据给定的url访问网络, 抓去html代码
* @param url
* @return
*/
protected String getHtmlFromInternet(String url) {
try {
URL mURL = new URL(url);
HttpURLConnection conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(10000);
conn.setReadTimeout(5000);
// conn.connect();
int responseCode = conn.getResponseCode();
if(responseCode == 200) {
InputStream is = conn.getInputStream();
String html = getStringFromInputStream(is);
return html;
} else {
Log.i(TAG, "访问失败: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 根据流返回一个字符串信息
* @param is
* @return
* @throws IOException
*/
private String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
String html = baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8
String charset = "utf-8";
if(html.contains("gbk") || html.contains("gb2312")
|| html.contains("GBK") || html.contains("GB2312")) { // 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
charset = "gbk";
}
html = new String(baos.toByteArray(), charset); // 对原有的字节数组进行使用处理后的编码名称进行编码
baos.close();
return html;
}
}