Android UI更新的几种方法总结
来源:爱站网时间:2020-01-11编辑:网友分享
随着开发项目的变化,一些入口界面会出现增减、或者内容变化、跳转界面变化等等问题,今天是爱站技术频道小编给大家带来的Android UI更新的几种方法总结。
随着开发项目的变化,一些入口界面会出现增减、或者内容变化、跳转界面变化等等问题,今天是爱站技术频道小编给大家带来的Android UI更新的几种方法总结。
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();
上述是爱站技术频道小编为大家介绍的Android UI更新的几种方法总结,希望对你学习这方面知识有所帮助,也希望大家能一如既往的支持我们。