Android子线程更新UI两种方法，androidui两种方法,大家都知道直接在子线程里

Android子线程更新UI两种方法，androidui两种方法,大家都知道直接在子线程里

大家都知道直接在子线程里更新UI是不被允许的,所以下面提供两种方法解决问题:

直接上代码:

    package com.wr.updateui;      import android.annotation.SuppressLint;      import android.app.Activity;      import android.os.Bundle;      import android.os.Handler;      import android.os.Message;      import android.view.Menu;      import android.view.MenuItem;      import android.view.View;      import android.view.View.OnClickListener;      import android.widget.Button;      import android.widget.TextView;      public class MainActivity extends Activity {          private static final int UPDATE_TEXT = 1;          private TextView tv;          private Button btn;          @SuppressLint("HandlerLeak")          private Handler handler = new Handler() {              public void handleMessage(Message msg) {                  switch (msg.what) {                  case UPDATE_TEXT:                      tv.setText("nihao");                  default:                      break;                  }              }          };          @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);              tv = (TextView) findViewById(R.id.textView);              btn = (Button) findViewById(R.id.button);              btn.setOnClickListener(new OnClickListener() {                  @Override                  public void onClick(View arg0) {                      // TODO Auto-generated method stub                      /**                       * 第一种使用Android的异步处理机制。                      */                      /*                     new Thread(new Runnable() {                         @Override                         public void run() {                             // TODO Auto-generated method stub                             Message message = new Message();                             message.what = UPDATE_TEXT;                             handler.sendMessage(message);                         }                     }).start();                     */                      /**                       * 第二种，直接使用runOnUiThread.                      */                      runOnUiThread(new Runnable() {                          @Override                          public void run() {                              // TODO Auto-generated method stub                              tv.setText("nihao");                          }                      });                  }              });          }          @Override          public boolean onCreateOptionsMenu(Menu menu) {              // Inflate the menu; this adds items to the action bar if it is present.              getMenuInflater().inflate(R.menu.main, menu);              return true;          }          @Override          public boolean onOptionsItemSelected(MenuItem item) {              // Handle action bar item clicks here. The action bar will              // automatically handle clicks on the Home/Up button, so long              // as you specify a parent activity in AndroidManifest.xml.              int id = item.getItemId();              if (id == R.id.action_settings) {                  return true;              }              return super.onOptionsItemSelected(item);          }      }