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：common_progressdialog_progressbar_background.xml Progressbar进度条图片和背景图片设置 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);
}