实例详解Android自定义ProgressDialog进度条对话框的实现

android sdk已经提供有进度条组件progressdialog组件，但用的时候我们会发现可能风格与我们应用的整体风格不太搭配，而且progressdialog的可定制行也不太强，这时就需要我们自定义实现一个progressdialog。

通过看源码我们发现，progressdialog继承自alertdialog，有一个progressbar和两个textview组成的，通过对progressdialog的源码进行改进就可以实现一个自定义的progressdialog。

1、效果：

首先看一下自定义commonprogressdialog和原生progressdialog的对比：

2、代码：

common_progress_dialog.xml 布局文件： 
<framelayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<linearlayout 
android:layout_width="798px"
android:layout_height="460px"
android:orientation="vertical"
android:background="@drawable/common_progress_dialog_background">
<textview
android:id="@+id/progress_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textsize="44px"
android:layout_margintop="113px"
android:layout_gravity="center_horizontal"
android:textcolor="#ffffff"
/>
<progressbar 
android:id="@+id/progress"
style="?android:attr/progressbarstylehorizontal"
android:layout_width="712px"
android:layout_height="30px"
android:layout_margintop="100px"
android:layout_marginleft="47px"
android:layout_centerhorizontal="true"
android:progressdrawable="@drawable/common_progressdialog_progressbar_background"
/>
<linearlayout 
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<textview
android:id="@+id/progress_percent"
android:layout_width="80px"
android:layout_height="wrap_content"
android:textsize="30px"
android:layout_marginleft="280px"
android:gravity="center_horizontal"
android:textcolor="#ffffff"
/>
<textview
android:id="@+id/progress_number"
android:layout_width="250px"
android:layout_height="wrap_content"
android:layout_marginleft="120px"
android:textsize="30px"
android:gravity="center_horizontal"
android:textcolor="#ffffff"
/>
</linearlayout>
</linearlayout>
</framelayout>
common_progressdialog_progressbar_background.xml progressbar进度条图片和背景图片设置 
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
>
<item
android:id="@android:id/background"
android:drawable="@drawable/common_progress_dialog_progressbar3"
/>
<item
android:id="@android:id/progress"
android:drawable="@drawable/common_progress_dialog_progressbar2"
/>
</layer-list>
commonprogressdialog.java类： 
package com.johnny.testactivity;
import java.text.numberformat;
import android.app.alertdialog;
import android.app.progressdialog;
import android.content.context;
import android.os.bundle;
import android.os.handler;
import android.os.message;
import android.text.spannable;
import android.text.spannablestring;
import android.text.style.stylespan;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.widget.progressbar;
import android.widget.textview;
public class commonprogressdialog extends alertdialog {
private progressbar mprogress;
private textview mprogressnumber;
private textview mprogresspercent;
private textview mprogressmessage;
private handler mviewupdatehandler;
private int mmax;
private charsequence mmessage;
private boolean mhasstarted;
private int mprogressval;
private string tag="commonprogressdialog";
private string mprogressnumberformat;
private numberformat mprogresspercentformat;
public commonprogressdialog(context context) {
super(context);
// todo auto-generated constructor stub
initformats();
}
@override
protected void oncreate(bundle savedinstancestate) {
// todo auto-generated method stub
super.oncreate(savedinstancestate);
setcontentview(r.layout.common_progress_dialog);
mprogress=(progressbar) findviewbyid(r.id.progress);
mprogressnumber=(textview) findviewbyid(r.id.progress_number);
mprogresspercent=(textview) findviewbyid(r.id.progress_percent);
mprogressmessage=(textview) findviewbyid(r.id.progress_message);
// layoutinflater inflater = layoutinflater.from(getcontext());
mviewupdatehandler = new handler() {
@override
public void handlemessage(message msg) {
// todo auto-generated method stub
super.handlemessage(msg);
int progress = mprogress.getprogress();
int max = mprogress.getmax();
double dprogress = (double)progress/(double)(1024 * 1024);
double dmax = (double)max/(double)(1024 * 1024);
if (mprogressnumberformat != null) {
string format = mprogressnumberformat;
mprogressnumber.settext(string.format(format, dprogress, dmax));
} else {
mprogressnumber.settext("");
}
if (mprogresspercentformat != null) {
double percent = (double) progress / (double) max;
spannablestring tmp = new spannablestring(mprogresspercentformat.format(percent));
tmp.setspan(new stylespan(android.graphics.typeface.bold),
0, tmp.length(), spannable.span_exclusive_exclusive);
mprogresspercent.settext(tmp);
} else {
mprogresspercent.settext("");
}
}
};
// view view = inflater.inflate(r.layout.common_progress_dialog, null);
// mprogress = (progressbar) view.findviewbyid(r.id.progress);
// mprogressnumber = (textview) view.findviewbyid(r.id.progress_number);
// mprogresspercent = (textview) view.findviewbyid(r.id.progress_percent);
// setview(view);
//mprogress.setmax(100);
onprogresschanged();
if (mmessage != null) {
setmessage(mmessage);
}
if (mmax > 0) {
setmax(mmax);
}
if (mprogressval > 0) {
setprogress(mprogressval);
}
}
private void initformats() {
mprogressnumberformat = "%1.2fm/%2.2fm";
mprogresspercentformat = numberformat.getpercentinstance();
mprogresspercentformat.setmaximumfractiondigits(0);
}
private void onprogresschanged() {
mviewupdatehandler.sendemptymessage(0);
}
public void setprogressstyle(int style) {
//mprogressstyle = style;
}
public int getmax() {
if (mprogress != null) {
return mprogress.getmax();
}
return mmax;
}
public void setmax(int max) {
if (mprogress != null) {
mprogress.setmax(max);
onprogresschanged();
} else {
mmax = max;
}
}
public void setindeterminate(boolean indeterminate) {
if (mprogress != null) {
mprogress.setindeterminate(indeterminate);
} 
// else {
// mindeterminate = indeterminate;
// }
}
public void setprogress(int value) {
if (mhasstarted) {
mprogress.setprogress(value);
onprogresschanged();
} else {
mprogressval = value;
} 
}
@override
public void setmessage(charsequence message) {
// todo auto-generated method stub
//super.setmessage(message);
if(mprogressmessage!=null){
mprogressmessage.settext(message);
}
else{
mmessage = message;
}
}
@override
protected void onstart() {
// todo auto-generated method stub
super.onstart();
mhasstarted = true;
}
@override
protected void onstop() {
// todo auto-generated method stub
super.onstop();
mhasstarted = false;
}
}

测试程序：

private void showdialog(){
mdialog = new commonprogressdialog(this);
mdialog.setmessage("正在下载");
mdialog.setprogressstyle(progressdialog.style_horizontal);
mdialog.setoncancellistener(new oncancellistener() {
@override
public void oncancel(dialoginterface dialog) {
// todo auto-generated method stub
//cancel(true);
}
});
mdialog.show();
mdialog.setmax(100*1024*1024);
mdialog.setprogress(65*1024*1024);
}