Android中在子线程中更新UI

1、Activity的 runOnUiThread  

textView = (TextView) findViewById( R.id.tv );
       new  Thread( new  Runnable() {
           @Override
           public  void  run() {

               runOnUiThread( new  Runnable() {
                   @Override
                   public  void  run() {
                       textView.setText(  "更新UI了" );
                   }
               });
           }
       }).start();

android Activity runOnUiThread() 方法使用

2、Handler sendEmptyMessage()

package  lib.com.myapplication;

import  android.os.Handler;
import  android.os.Message;
import  android.support.v7.app.AppCompatActivity;
import  android.os.Bundle;
import  android.widget.TextView;

public  class  MainActivity  extends  AppCompatActivity {

    private  TextView textView ;

    Handler handler =  new  Handler( ) {
        @Override
        public  void  handleMessage(Message msg) {
            super .handleMessage(msg);
            textView.setText(  "Ui更新了" );
        }
    };

    @Override
    protected  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = (TextView) findViewById( R.id.tv );
        new  Thread( new  Runnable() {
            @Override
            public  void  run() {
                try  {
                    Thread.sleep(  2000  );
                }  catch  (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.sendEmptyMessage(  2  ) ;
            }
        }).start();

    }
}

3、Handler  post()

package  lib.com.myapplication;
import  android.os.Bundle;
import  android.os.Handler;
import  android.support.v7.app.AppCompatActivity;
import  android.widget.TextView;

public  class  MainActivity  extends  AppCompatActivity {

    private  TextView textView ;

    Handler handler =  new  Handler();

    @Override
    protected  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = (TextView) findViewById( R.id.tv );

        new  Thread( new  Runnable() {
            @Override
            public  void  run() {
                try  {
                    Thread.sleep(  2000  );
                }  catch  (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.post( new  Runnable() {
                    @Override
                    public  void  run() {
                        textView.setText(  "Ui更新了" );
                    }
                }) ;
            }
        }).start();

    }
}

4、view Post()　

textView = (TextView) findViewById( R.id.tv );
       new  Thread( new  Runnable() {
           @Override
           public  void  run() {
               try  {
                   Thread.sleep(  2000  );
               }  catch  (InterruptedException e) {
                   e.printStackTrace();
               }

               textView.post( new  Runnable() {
                   @Override
                   public  void  run() {
                       textView.setText(  "Ui更新了" );
                   }
               }) ;
           }
       }).start();