获取网络文字 更新UI
2017-11-06 14:35
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清单文件:
/**
* 主线程 ---UI线程,不可以阻塞, 如果阻塞会报ANR(application not response)
* 子线程---, 耗时操作,联网就是耗时操作;
*/
public class MainActivity extends AppCompatActivity {
public String urlString = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
String urlBitmap = "http://img.my.csdn.net/uploads/201407/26/1406383265_8550.jpg";
String tag = "wzq";
private ImageView iv;
private TextView tv;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
int what = msg.what;
switch (what) {
case 1:
String infoText = (String) msg.obj;
tv.setText(infoText);
break;
case 2:
break;
}
}
};
/**
* alt+enter 自动补全
* fbc --再tabfindViewByIde的快捷键;
* ctrl+alt +F 声明全局变量
* ctrl+alt +L 格式化代码
*
* @param savedInstanceState
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
iv = (ImageView) findViewById(R.id.iv);
tv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//联网是耗时操作,不能直接在主线程写
//子线程不能更新UI
new Thread() {
@Override
public void run() {
super.run();
String netJson = NetUtil.getNetJson(urlString);
Gson gson = new Gson();
Product product = gson.fromJson(netJson, Product.class);
String infoText = product.getInfo();
Message message = new Message();
message.obj = infoText;
message.what = 1;
handler.sendMessage(message);
}
}.start();
}
});
}
}
public class NetUtil {
private static String tag = "getNetJson";
public static String getNetJson(String urlString){
try {
//url对象封装接口字符串
URL url = new URL(urlString);
//用url打开连接, 返回值我们用HttpURLConnection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
//可拼接的字符串
StringBuilder stringBuilder = new StringBuilder();
String temp ="";
while ( (temp= bufferedReader.readLine()) != null){
stringBuilder.append(temp);
}
String jsonString = stringBuilder.toString();
return jsonString;
} catch (MalformedURLException e) {
4000
e.printStackTrace();
Log.e(tag, "getNetJson: "+ e.toString() );
}catch (IOException e) {
e.printStackTrace();
Log.e(tag, "getNetJson: "+ e.toString() );
}
return "";
}
}
<uses-permission android:name="android.permission.INTERNET" /> <!--==============================--> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <!--读取网络状态的权限--> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
/**
* 主线程 ---UI线程,不可以阻塞, 如果阻塞会报ANR(application not response)
* 子线程---, 耗时操作,联网就是耗时操作;
*/
public class MainActivity extends AppCompatActivity {
public String urlString = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
String urlBitmap = "http://img.my.csdn.net/uploads/201407/26/1406383265_8550.jpg";
String tag = "wzq";
private ImageView iv;
private TextView tv;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
int what = msg.what;
switch (what) {
case 1:
String infoText = (String) msg.obj;
tv.setText(infoText);
break;
case 2:
break;
}
}
};
/**
* alt+enter 自动补全
* fbc --再tabfindViewByIde的快捷键;
* ctrl+alt +F 声明全局变量
* ctrl+alt +L 格式化代码
*
* @param savedInstanceState
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
iv = (ImageView) findViewById(R.id.iv);
tv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//联网是耗时操作,不能直接在主线程写
//子线程不能更新UI
new Thread() {
@Override
public void run() {
super.run();
String netJson = NetUtil.getNetJson(urlString);
Gson gson = new Gson();
Product product = gson.fromJson(netJson, Product.class);
String infoText = product.getInfo();
Message message = new Message();
message.obj = infoText;
message.what = 1;
handler.sendMessage(message);
}
}.start();
}
});
}
}
public class NetUtil {
private static String tag = "getNetJson";
public static String getNetJson(String urlString){
try {
//url对象封装接口字符串
URL url = new URL(urlString);
//用url打开连接, 返回值我们用HttpURLConnection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
//可拼接的字符串
StringBuilder stringBuilder = new StringBuilder();
String temp ="";
while ( (temp= bufferedReader.readLine()) != null){
stringBuilder.append(temp);
}
String jsonString = stringBuilder.toString();
return jsonString;
} catch (MalformedURLException e) {
4000
e.printStackTrace();
Log.e(tag, "getNetJson: "+ e.toString() );
}catch (IOException e) {
e.printStackTrace();
Log.e(tag, "getNetJson: "+ e.toString() );
}
return "";
}
}
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