Android 两种异步操作方式

来源：互联网发布：collator java 编辑：程序博客网时间：2024/05/21 09:05

两种方法各有各的用法，看情况处理

//第一种，新开一条线程，在传智播客的视频中有讲到

package sn.len.asynctask;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;public class AsyncTaskDemoActivity extends Activity implements View.OnClickListener {    @Override    public void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                View but1=findViewById(R.id.button01);        View but2=findViewById(R.id.button02);        but1.setOnClickListener(this);        but2.setOnClickListener(this);    }@Overridepublic void onClick(View v) {try {switch (v.getId()) {case R.id.button01:{//新开一条线程new Thread(new Runnable(){@Overridepublic void run() {try {Thread.sleep(5*1000);}catch (InterruptedException e) {e.printStackTrace();}}}).start();}break;case R.id.button02:{Log.i("INFO", "Hello World");}break;default:break;}} catch (Exception e) {e.printStackTrace();}}    }

//第二种，自己写个类，继承自AsyncTaks<Void,Void,Void>这个类

package sn.len.asynctask;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;public class AsyncTaskDemoActivity extends Activity implements View.OnClickListener {    @Override    public void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                View but1=findViewById(R.id.button01);        View but2=findViewById(R.id.button02);        but1.setOnClickListener(this);        but2.setOnClickListener(this);    }@Overridepublic void onClick(View v) {try {switch (v.getId()) {case R.id.button01:{//新开一条线程，调用execute其实就是调用doInBackground方法AsyncTaskThread att=new AsyncTaskThread();att.execute();}break;case R.id.button02:{Log.i("INFO", "Hello World");}break;default:break;}} catch (Exception e) {e.printStackTrace();}}    }

//AsyncTaskThread.java

package sn.len.asynctask;import android.os.AsyncTask;import android.util.Log;public class AsyncTaskThread extends AsyncTask<Void, Void, Void> {//其实doInBackground也是新开了一条线程@Overrideprotected Void doInBackground(Void... params) {Log.i("doInBackground", "Start --doInBackground");try {Thread.sleep(5*1000);}catch (InterruptedException e) {e.printStackTrace();}return null;}}

后面这种，可以看一下mars的视频，第四章第六集，异步任务(二) 讲得很详细