.xml代码如下:
<?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:
package org.lxh.demo; import 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])); } } }
时间: 2024-10-05 05:32:21