Android 异步处理工具类（AsyncTask），androidasynctask, <?xml ve
Android 异步处理工具类（AsyncTask），androidasynctask, <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <ProgressBar android:id="@+id/bar" android:layout_width="fill_parent" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal"/> <TextView android:id="@+id/info" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> </LinearLayout>
.java代码如下：```javaimport android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
public class Hello extends Activity {
private ProgressBar bar = null;
private TextView info = null;
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 生命周期方法 super.setContentView(R.layout.main); // 设置要使用的布局管理器 this.bar = (ProgressBar) super.findViewById(R.id.bar); this.info = (TextView) super.findViewById(R.id.info); ChildUpdate child = new ChildUpdate();//子任务对象 child.execute(100);//设置休眠时间}private class ChildUpdate extends AsyncTask<Integer, Integer, String> {//覆写如下方法
@Override
protected String doInBackground(Integer... params) {//处理后台任务
for (int x = 0; x < 100; x++) {
Hello.this.bar.setProgress(x);//进度条设置
this.publishProgress(x);//传递每次更新内容
try {
Thread.sleep(params[0]);
} catch (InterruptedException e) {
e.printStackTrace();
}
} return "执行完毕！"; } @Override protected void onPostExecute(String result) {//任务执行完后执行 Hello.this.info.setText(result); } @Override protected void onProgressUpdate(Integer... progress) {//每次更新后的数值 Hello.this.info.setText("当前进度为：" + String.valueOf(progress[0])); }}}
```
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