ProgressBar和ProgressDialog（三）

四、ProgressDialog简介

ProgressDialog的本质就是在一对话框中显示ProgressDialog，并另外显示一些关于进度的等文本信息。虽然ProgressDialog继承于AlertDialog，但是它并没取消操作按钮，用户只能通过back键来取消和返回。如果想要取消和返回按钮请参照下文关于ProgressDialog的使用实例。

       ProgressDialog支持ProgressDialog.STYLE_HORIZONTAL和ProgressDialog.STYLE_SPINNER，这两种风格。但是当ProgressDialog.STYLE_HORIZONTAL且indeterminate为true时，进度的文本信息无法更新，这个似乎是Google的bug.

另外我们可以通过ProgressDialog的静态的show（）系列函数快速的创建一个ProgressDialog，但是此时风格只能是STYLE_SPINNER。

五、ProgressDialog使用实例

      以下是一个ProgressDialog的使用实例，ProgressDialog其实很简单，但是似乎它的功能也太简单。

程序主界面，截图1

 点击"normal"，截图2

 

点击"Custom",将显示一个我自己实现的ProgressBar对话框，截图3

 

点击“ineterminate”,截图4

 

点击"SPINNER",截图5

 

点击“Quick”,截图6

 

代码

ProgressDialogSampleActivity.java文件

package com.teleca.robin;

import java.util.ArrayList;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import android.app.ProgressDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.os.Bundle;

import android.os.Handler;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.Button;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

public class ProgressDialogSampleActivity extends Activity {

/**

 * menu list item array

 */

protected ArrayList<String> mArrayListItemsdata = new ArrayList<String>();

private ListView mListView = null;

/**

 * menu list adapter

 */

private MyArrayAdapter mAdapter = null;

public static final int PROGRESS_DIALOG_HORIZONTAL_1 = 1000;

public static final int PROGRESS_DIALOG_CUSTOM = 1001;

public static final int PROGRESS_DIALOG_INDETERMINATE_1 = 1002;

public static final int PROGRESS_DIALOG_SPINNER_1 = 1003;

public static final int PROGRESS_DIALOG_QUICK = PROGRESS_DIALOG_SPINNER_1 + 1;

final static String tag = "robin";

/**

 * progress bar sample menu text

 */

private String[] mStrings = { "normal", "Custom", "indeterminate",

"SPINNER", "Quick" };

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main2);

mListView = (ListView) findViewById(R.id.ListView01);

for (int i = 0; i < mStrings.length; i++) {

mArrayListItemsdata.add(mStrings[i]);

}

mAdapter = new MyArrayAdapter(this, R.layout.row_item,

mArrayListItemsdata);

mListView.setAdapter(mAdapter);

/**

 * 

 * Menu selection handler for displaying proper progress bar example.

 */

mListView.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView<?> parent, View view,

int position, long id) {

onListItemClick(mListView, position, id);

}

});

}

/**

 * Show progress bar example as per user selection on list

 */

protected void onListItemClick(ListView l, int position, long id) {

switch (position) {

case 0:

showDialog(PROGRESS_DIALOG_HORIZONTAL_1);

break;

case 1:

showDialog(PROGRESS_DIALOG_CUSTOM);

break;

case 2:

showDialog(PROGRESS_DIALOG_INDETERMINATE_1);

break;

case 3:

showDialog(PROGRESS_DIALOG_SPINNER_1);

break;

case 4:

showDialog(PROGRESS_DIALOG_QUICK);

break;

}

}

@Override

protected Dialog onCreateDialog(int id) {

Context context = this;

LayoutInflater factory = LayoutInflater.from(this);

switch (id) {

case PROGRESS_DIALOG_HORIZONTAL_1: {

final ProgressDialog progressDialog = new ProgressDialog(context);

progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

progressDialog.setMessage("downloading");

if (id == PROGRESS_DIALOG_INDETERMINATE_1)

progressDialog.setIndeterminate(true);

final Toast toast = Toast.makeText(context,

"downloading is canceled", Toast.LENGTH_LONG);

DialogInterface.OnDismissListener dismissListener = new DialogInterface.OnDismissListener() {

@Override

public void onDismiss(DialogInterface dialog) {

// TODO Auto-generated method stub

if (progressDialog.getProgress() < progressDialog.getMax()) {

blCanced = true;

toast.show();

}

}

};

progressDialog.setOnDismissListener(dismissListener);

return progressDialog;

}

                //显示一个我自己实现了ProgressBar的对话框

case PROGRESS_DIALOG_CUSTOM: {

AlertDialog.Builder progressSample1 = new AlertDialog.Builder(

context);

View progressBody = factory.inflate(R.layout.my_progress_dialog,

null);

final TextView bodyTitle = (TextView) progressBody

.findViewById(R.id.progress11bodytext);

final TextView numberText = (TextView) progressBody

.findViewById(R.id.progress11_number);

final ProgressBar progressBar = (ProgressBar) progressBody

.findViewById(R.id.ProgressBar11);

final Button btnCancel = (Button) progressBody

.findViewById(R.id.cancel);

progressBar.setMax(100);

bodyTitle.setText("downloding");

numberText.setText("(" + progressBar.getProgress() + "/"

+ progressBar.getMax() + ")");

progressSample1.setView(progressBody);

progressSample1.setMessage("Please Wating...");

final Toast toast = Toast.makeText(context, bodyTitle.getText()

+ " is canceled", Toast.LENGTH_LONG);

DialogInterface.OnDismissListener dismissListener = new DialogInterface.OnDismissListener() {

@Override

public void onDismiss(DialogInterface dialog) {

// TODO Auto-generated method stub

if (progressBar.getProgress() < progressBar.getMax()) {

blCanced = true;

toast.show();

}

}

};

final AlertDialog dialog = progressSample1.create();

OnClickListener cancelOnClickListener = new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

dialog.dismiss();

}

};

btnCancel.setOnClickListener(cancelOnClickListener);

dialog.setOnDismissListener(dismissListener);

return dialog;

}

case PROGRESS_DIALOG_INDETERMINATE_1: 

/**

 * Indeterminate的ProgressDialog的进度看不到变化，应该是Google的BUG.

 */

{

final ProgressDialog progressDialog = new ProgressDialog(context);

progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

progressDialog.setIndeterminate(true);

progressDialog.setMax(100);

progressDialog.setMessage("downloading");

final Toast toast = Toast.makeText(context,

"downloading is canceled", Toast.LENGTH_LONG);

DialogInterface.OnDismissListener dismissListener = new DialogInterface.OnDismissListener() {

@Override

public void onDismiss(DialogInterface dialog) {

// TODO Auto-generated method stub

if (progressDialog.getProgress() < progressDialog.getMax()) {

blCanced = true;

toast.show();

}

}

};

progressDialog.setOnDismissListener(dismissListener);

return progressDialog;

}

case PROGRESS_DIALOG_SPINNER_1:

{

ProgressDialog progressDialog = new ProgressDialog(context);

progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);

progressDialog.setMessage("connecting");

mProgressStatus = 0;

final Toast toast = Toast.makeText(context,

"connecting is canceled", Toast.LENGTH_LONG);

DialogInterface.OnDismissListener dismissListener = new DialogInterface.OnDismissListener() {

@Override

public void onDismiss(DialogInterface dialog) {

// TODO Auto-generated method stub

if (mProgressStatus < 100) {

blCanced = true;

toast.show();

}

}

};

progressDialog.setOnDismissListener(dismissListener);

return progressDialog;

}

case PROGRESS_DIALOG_QUICK: {

final Toast toast = Toast.makeText(context, "loading is canceled",

Toast.LENGTH_LONG);

DialogInterface.OnCancelListener cancelListener = new DialogInterface.OnCancelListener() {

@Override

public void onCancel(DialogInterface dialog) {

// TODO Auto-generated method stub

if (mProgressStatus < 100) {

blCanced = true;

toast.show();

}

}

};

ProgressDialog progressDialog = ProgressDialog.show(context,

"Connecting to the Internet", "Please waiting", true,

true, cancelListener);

return progressDialog;

}

}

return null;

}

@Override

protected void onPrepareDialog(int id, Dialog dialog) {

super.onPrepareDialog(id, dialog);

final Context context = this;

Log.i(tag, dialog + "id:" + id);

switch (id) {

case PROGRESS_DIALOG_HORIZONTAL_1: {

final ProgressDialog progressDialog = (ProgressDialog) dialog;

// initializing progress when user re-enter

progressDialog.setProgress(0);

mProgressStatus = 0;

blCanced = false;

final int progressBarMax = progressDialog.getMax();

final Toast toast = Toast.makeText(context,

"downloading is finished", Toast.LENGTH_LONG);

// Start lengthy operation in a background thread

new Thread(new Runnable() {

public void run() {

while (mProgressStatus < progressBarMax) {

doWork();

Log.i(tag, "do working" + mProgressStatus);

// Update the progress bar

handler.post(new Runnable() {

public void run() {

progressDialog.setProgress(mProgressStatus);

if (mProgressStatus >= progressBarMax) {

toast.show();

}

}

});

if (blCanced)

break;

}

}

}).start();

progressDialog.show();

}

break;

//显示一个我自己实现了ProgressBar的对话框

case PROGRESS_DIALOG_CUSTOM: {

final ProgressBar progressBar = (ProgressBar) dialog

.findViewById(R.id.ProgressBar11);

// initializing progress when user re-enter

progressBar.setProgress(0);

mProgressStatus=0;

blCanced = false;

final int progressBarMax = progressBar.getMax();

final TextView numberText = (TextView) dialog

.findViewById(R.id.progress11_number);

final Button btnCancel = (Button) dialog.findViewById(R.id.cancel);

final Toast toast = Toast.makeText(context, "finish",

Toast.LENGTH_LONG);

new Thread(new Runnable() {

public void run() {

while (mProgressStatus < progressBarMax) {

mProgressStatus = doWork();

// Update the progress bar

handler.post(new Runnable() {

public void run() {

progressBar.setProgress(mProgressStatus);

numberText.setText("("

+ progressBar.getProgress() + "/"

+ progressBarMax + ")");

if (mProgressStatus >= progressBarMax) {

btnCancel.setText("back");

toast.show();

}

}

});

if (blCanced)

break;

}

}

}).start();

dialog.show();

}

break;

case PROGRESS_DIALOG_INDETERMINATE_1: {

final ProgressDialog progressDialog = (ProgressDialog) dialog;

// initializing progress when user re-enter

mProgressStatus = 0;

progressDialog.setProgress(mProgressStatus);

blCanced = false;

final int progressBarMax = progressDialog.getMax();

final Toast toast = Toast.makeText(context,

"downloading is finished", Toast.LENGTH_LONG);

// Start lengthy operation in a background thread

new Thread(new Runnable() {

public void run() {

while (mProgressStatus < progressBarMax) {

doWork();

Log.i(tag, "do working" + mProgressStatus);

// Update the progress bar

handler.post(new Runnable() {

public void run() {

Log.i(tag, progressDialog.getProgress()

+ "mProgressStatu:" + mProgressStatus);

progressDialog.setProgress(mProgressStatus);

Log.i(tag, "hi:" + progressDialog.getProgress());

if (mProgressStatus >= progressBarMax) {

toast.show();

progressDialog.dismiss();

}

}

});

if (blCanced)

break;

}

}

}).start();

progressDialog.show();

}

break;

case PROGRESS_DIALOG_SPINNER_1: {

final Toast toast = Toast.makeText(context,

"connected", Toast.LENGTH_LONG);

blCanced = false;

mProgressStatus=0;

final Dialog myDialog=dialog;

new Thread(new Runnable() {

public void run() {

while (mProgressStatus < 100) {

doWork();

if (blCanced)

break;

}

if (!blCanced)

{

toast.show();

handler.post(new Runnable() {

public void run() {

myDialog.dismiss();

}

});

}

}

}).start();

dialog.show();

}

break;

case PROGRESS_DIALOG_QUICK:

blCanced = false;

mProgressStatus=0;

final Dialog myDialog=dialog;

new Thread() {

public void run() {

while (mProgressStatus < 100) {

doWork();

if (blCanced)

break;

}

if (!blCanced)

handler.post(new Runnable() {

public void run() {

myDialog.dismiss();

}

});

}

}.start();

dialog.show();

break;

}

}

boolean blCanced = false;

final Handler handler = new Handler();

private int mProgressStatus = 0;

int doWork() {

try {

Thread.sleep(200);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

mProgressStatus = mProgressStatus + 1;

return mProgressStatus;

}

}