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/**	 * 问题描述:	 * 创建和显示对话框的时候报错	 * Unable to add window -- token null is not for an application	 * 	 * 问题修正:	 * 不可使用Builder builder=new Builder(getApplicationContext());	 * 应该使用Builder builder=new Builder(MainActivity.this);	 */	private void showDialog(){		 Dialog dialog;		 //正确		 Builder builder=new Builder(MainActivity.this);		 //错误		 //Builder builder=new Builder(getApplicationContext());         builder.setIcon(R.drawable.ic_launcher);         builder.setTitle(getResources().getString(R.string.dialog_title));         builder.setMessage(R.string.dialog_message);         builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {				@Override				public void onClick(DialogInterface dialog, int arg1) {				}			});         builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {				@Override				public void onClick(DialogInterface dialog, int arg1) {				}			});                  dialog=builder.create();         dialog.show();    }

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