Android 子线程 更新 UI 界面 总结
16lz
2021-01-23
package com.jrhcode.morethreadtest;import java.util.concurrent.Executors;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.app.Activity;import android.view.Menu;import android.widget.TextView;import android.widget.Toast;/** * * 主要功能是：在子线程中来更改TextView的显示内容 * * android 多线程编程 1：通过handler 在新启动的线程中更新UI组件 Handler.post(new Runnable()); 2:handler.postdelayed(new Runnable, delay); 3: Activity.runOnUiThread(); 4:AsyncTask 5:线程池 * * @author Administrator * */public class MainActivity extends Activity {TextView tv;private Handler mHandler;private String TAG = MainActivity.class.getSimpleName();int i = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) findViewById(R.id.tv);mHandler = new Handler();// initHandler();// initHandler2();// initHandler3();// updateTv();// updateTVV();threedPool();}private void threedPool() {// TODO Auto-generated method stubExecutors.newSingleThreadExecutor().submit(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubSystem.out.println(Thread.currentThread().getName());tv.setText(TAG);mHandler.post(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubtv.setText("this is handler post");}});}});}/** * */private void updateTVV() {// TODO Auto-generated method stubnew MyTask().execute();}/** * 方法3 */private void updateTv() {// TODO Auto-generated method stubnew Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubMainActivity.this.runOnUiThread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubtv.setText(TAG);}});}}).start();}/** * 延迟3秒 */private void initHandler3() {// TODO Auto-generated method stubnew Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubmHandler.postDelayed(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubtv.setText(TAG);}}, 3000);}}).start();}/** * 在子线程中方法 */private void initHandler2() {// TODO Auto-generated method stubnew Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubmHandler.post(new Runnable() {@Overridepublic void run() {System.out.println(Thread.currentThread().getName());tv.setText(TAG);}});}}).start();}/** * Mothod 1; 该方法是在注线程中操作UI; */private void initHandler() {// TODO Auto-generated method stubmHandler.post(new Runnable() {@Overridepublic void run() {Toast.makeText(MainActivity.this,Thread.currentThread().getName(), 0).show();tv.setText(TAG);}});}class MyTask extends AsyncTask<String, Void, String> {@Overrideprotected String doInBackground(String... params) {// TODO Auto-generated method stubtry {Thread.sleep(3000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubsuper.onPostExecute(result);tv.setText(TAG);}}} 更多相关文章
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