3.4 复杂进度对话框

这一小节我们来给大家讲讲复杂进度对话框的用法，先看截图吧

大家一看就知道是一个带有下载进度的对话框，那么了解这个对话框常用用法如下

• 初始化进度条
• 设置图标、标题
• 设置进度条风格
• 设置进度条起始值
• 设置进度条每次增长值

这里我们就把ProgressDialog常用的代码方法也列举出来供大家参考

• setIcon ，设置进度对话框的图标
• setProgress， 设置进度对话框的起始值
• setTitle， 设置进度对话框的标题
• setProgressStyle， 设置进度对话框的样式
• show， 显示对话框
• incrementProgressBy，设置进度对话框的增长值
• setIndeterminate, 不显示进度值
• setMessage, 设置进度对话框中下载内容信息
• OnCancelListener，监听进度对话框取消事件
• OnDismissListener，监听进度对话框消失事件

下面就是代码的具体实现

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        android:onClick="show"></Button>

</RelativeLayout>

package com.gxa;

import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnDismissListener;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity implements OnCancelListener, OnDismissListener {
    private ProgressDialog dialog;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    public void show(View view) {
        onCreateProgressDialog();
        dialog.setOnCancelListener(this);
        dialog.setOnDismissListener(this);
    }
    
    public void onCreateProgressDialog() {
        dialog = new ProgressDialog(this);
        dialog.setIcon(R.drawable.ic_launcher);
        dialog.setTitle("下载...");
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        dialog.setProgress(0);
        dialog.show();
        new Thread(new Runnable() {

            @Override
            public void run() {
                for (int i = 0; i < 25; i++) {
                    try {
                        Thread.sleep(1000);
                        dialog.incrementProgressBy((int) 100 / 25);
                    } catch (InterruptedException e) {
                        dialog.cancel();
                    }
                }
                dialog.dismiss();
            }
            
        }).start();
    }

    @Override
    public void onCancel(DialogInterface dialog) {
        Toast.makeText(this, "下载取消", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        Toast.makeText(this, "下载完成", Toast.LENGTH_SHORT).show();
    }

}

文字内容来自：国信安刘阳