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Android ApiDemos示例解析(184):Views->Progress Bar->3. Dialogs

本例介绍使用ProgressDialog 的用法,我们之前也在Dialog中简单介绍过ProgressDialog ,参见Android ApiDemos示例解析(22):App->Dialog

ProgressDialog为AlertDialog的子类,ProgressDialog 无需通过AlertDialog.Builder 构造,可以直接通过构造函数来创建ProgressDialog的实例。ProgressDialog可以显示一个标题和一个进度条。因此比AlertDialog多了几个方法:setProgressStyle ,setMax等来配置进度条的属性。

本例主要采用”indeterminate”模式显示ProgressDialog,一个设置对话框标题,一个不设置标题


[java] 
@Override 
protected Dialog onCreateDialog(int id) { 
 switch (id) { 
 case DIALOG1_KEY: { 
 ProgressDialog dialog = new ProgressDialog(this); 
 dialog.setTitle("Indeterminate"); 
 dialog.setMessage("Please wait while loading..."); 
 dialog.setIndeterminate(true); 
 dialog.setCancelable(true); 
 return dialog; 
 } 
 case DIALOG2_KEY: { 
 ProgressDialog dialog = new ProgressDialog(this); 
 dialog.setMessage("Please wait while loading..."); 
 dialog.setIndeterminate(true); 
 dialog.setCancelable(true); 
 return dialog; 
 } 
 } 
 return null; 

@Override
protected Dialog onCreateDialog(int id) {
 switch (id) {
 case DIALOG1_KEY: {
 ProgressDialog dialog = new ProgressDialog(this);
 dialog.setTitle("Indeterminate");
 dialog.setMessage("Please wait while loading...");
 dialog.setIndeterminate(true);
 dialog.setCancelable(true);
 return dialog;
 }
 case DIALOG2_KEY: {
 ProgressDialog dialog = new ProgressDialog(this);
 dialog.setMessage("Please wait while loading...");
 dialog.setIndeterminate(true);
 dialog.setCancelable(true);
 return dialog;
 }
 }
 return null;
}

 

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补充:移动开发 , Android ,
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