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1、Handler类，主要用于复杂的通信，但操作相对复杂
public class MainActivity extends Activity {
private static final int SET_TEXT = 1;
private static final int ERROR = 2;
private EditText metPath, metShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
setListener();
}
Handler handler = new Handler() {
public void handleMessage(Message msg) {
String result = (String) msg.obj;
switch (msg.what) {
case SET_TEXT:
metShow.setText(result);
break;
case ERROR:
Toast.makeText(MainActivity.this, "操作失败", Toast.LENGTH_LONG).show();
break;
}
};
};
private void setListener() {
findViewById(R.id.btnComfire).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new ChildThread().start();
}
});
}
private void initView() {
metPath = (EditText) findViewById(R.id.evPath);
metShow = (EditText) findViewById(R.id.etShow);
}
/**
* 连接网络属于耗时操作，放到子线程中进行相应操作
* @author CHJ
*
*/
class ChildThread extends Thread {
public void run() {
String path = metPath.getText().toString().trim();
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 设置请求参数, 这里为了简单只设置两种
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
int code = conn.getResponseCode();
if (200 == code) {// 建立连接成功
// 获取网页源代码并且转换成字符串
InputStream is = conn.getInputStream();
String result = new UtilTools().streamToString(is);
if (result == null) {
new UtilTools().sendInfoToMainThread(handler, ERROR,null);
} else {
new UtilTools().sendInfoToMainThread(handler, SET_TEXT,result);
}
} else {
new UtilTools().sendInfoToMainThread(handler, ERROR, null);
}
} catch (Exception e) {
e.printStackTrace();
new UtilTools().sendInfoToMainThread(handler, ERROR, null);
}
};
}
}
class UtilTools {
/**
* 将一个输出流转换成字符串
* @param is
* @return 字符串
*/
public String streamToString(InputStream is) {
// 在这个方法中还可以处理乱码，这里就不操作了。思路是通过解析
// 网页的源码，可以得到网页的编码格式，然后进行相应操作
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String result = null;
try {
String temp = null;
while ((temp = br.readLine()) != null) {
sb.append(temp);
}
result = sb.toString().trim();
is.close();
return result;
} catch (Exception e) {
e.printStackTrace();
try {
is.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return null;
}
}
/**
* 往主线程发送消息，这里主要是考虑代码的复用
* @param handler
*/
public void sendInfoToMainThread(Handler handler, int tag, String obj) {
Message msg = new Message();
msg.what = tag;
msg.obj = obj;
handler.sendMessage(msg);
}
}
2、runOnUiThread()主要用于简单的通信，操作简单。
runOnUiThread(new Runnable() {
public void run() {
// 操作主线程的UI
}
});
public class MainActivity extends Activity {
private EditText metPath, metShow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
setListener();
}
private void setListener() {
findViewById(R.id.btnComfire).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new Thread() {
public void run() {
String path = metPath.getText().toString().trim();
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 设置请求参数, 这里为了简单只设置两种
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
int code = conn.getResponseCode();
if (200 == code) {// 建立连接成功
// 获取网页源代码并且转换成字符串
InputStream is = conn.getInputStream();
final String result = new UtilTools()
.streamToString(is);
if (result == null) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"操作失败", Toast.LENGTH_LONG).show();
}
});
} else {
runOnUiThread(new Runnable() {
public void run() {
metShow.setText(result);
}
});
}
} else {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"操作失败", Toast.LENGTH_LONG).show();
}
});
}
} catch (Exception e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"操作失败", Toast.LENGTH_LONG).show();
}
});
}
};
}.start();
}
});
}
private void initView() {
metPath = (EditText) findViewById(R.id.evPath);
metShow = (EditText) findViewById(R.id.etShow);
}
}
class UtilTools {
/**
* 将一个输出流转换成字符串
*
* @param is
* @return 字符串
*/
public String streamToString(InputStream is) {
// 在这个方法中还可以处理乱码，这里就不操作了。思路是通过解析
// 网页的源码，可以得到网页的编码格式，然后进行相应操作
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String result = null;
try {
String temp = null;
while ((temp = br.readLine()) != null) {
sb.append(temp);
}
result = sb.toString().trim();
is.close();
return result;
} catch (Exception e) {
e.printStackTrace();
try {
is.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return null;
}
}
}