Android 更新UI的几种方式

时间:2023-03-09 07:09:45
Android 更新UI的几种方式

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(); }
}

在子线程中切换到主线程

        new Thread(new Runnable() {
@Override
public void run() {
LogUtil.d( "ttt 11111111111" + Thread.currentThread().getName() );
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
LogUtil.d( "ttt 55555555" + Thread.currentThread().getName() );
}
}); LogUtil.d( "ttt 22222222222" + Thread.currentThread().getName() );
LogUtil.d( "ttt 33333333333" + Thread.currentThread().getName() );
LogUtil.d( "ttt 44444444444" + Thread.currentThread().getName() ); }
}).start();

  结果

 ttt  11111111111Thread-155
ttt 22222222222Thread-155
ttt 33333333333Thread-155
ttt 44444444444Thread-155
ttt 55555555main

  可见这种方式可以快速切换线程,从log日志来看,切换到主线程不会阻塞子线程。

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();

总结:

1、其实上面的四种方式都可归结于一种方式:handler 用于Android线程之间的通信。

2、为什么android要求只能在UI线程进行UI操作? 主要还是为了避免多线程造成的并发的问题。在单线程操作UI是安全的。