【Android】进度条对话框ProgressDialog

ProgressDialog提供了水平进度条和环形进度条：

1.progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);// 水平进度条

2.progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);// 环形进度条

默认为环形进度条。

下面的例子通过水平进度条模拟下载任务。

Activity类：

package com.zzj.ui.progressdialog;

import java.lang.reflect.Field;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;

import com.zzj.ui.R;

public class ProgressDialogActivity extends Activity {
private boolean downloadFinish = false;
private boolean downloadPause = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.progressdialog_activity);
}

public void download(View v) {
downloadFinish = false;
downloadPause = false;
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("正在下载...");
progressDialog.setTitle("下载任务");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);// 水平进度条
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.setCancelable(false);
progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "取消",
new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
setMShowing(dialog, true);
downloadFinish = true;
progressDialog.dismiss();
}
});
progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "暂停",
new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
setMShowing(dialog, false);
if (downloadPause) {// 继续下载
downloadPause = false;
progressDialog.getButton(which).setText("暂停");
progressDialog.setMessage("正在下载...");
} else {// 暂停下载
downloadPause = true;
progressDialog.getButton(which).setText("继续");
progressDialog.setMessage("已暂停下载");
}

}
});
progressDialog.show();

new Thread(new Runnable() {

@Override
public void run() {
while (!downloadFinish) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
int p = progressDialog.getProgress();
if (p == 100) {
setMShowing(progressDialog, true);
downloadFinish = true;
progressDialog.dismiss();
} else if (!downloadPause) {
progressDialog.setProgress(p + 10);
}
}
}
}).start();

}

/**
* 设置对话框是否显示
*
* @param dialog
* @param mShowing
*/
private void setMShowing(DialogInterface dialog, boolean mShowing) {
try {
Field field = dialog.getClass().getSuperclass().getSuperclass()
.getDeclaredField("mShowing");
field.setAccessible(true);
field.set(dialog, mShowing);
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
}

}

布局文件：

<Button
android:id="@+id/download_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="download"
android:text="下载" />

效果图：