ProgressDialog(三)——代码实现屏幕正中显示ProgressDialog(ProgressBar)

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MainActivity如下:

package cc.testprogressdialog;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.FrameLayout;import android.widget.LinearLayout;import android.widget.ProgressBar;import android.app.Activity;import android.app.ProgressDialog;import android.content.Context;/** * Demo描述: * 利用代码在屏幕中间位置显示ProgressDialog和ProgressBar *  * 参考资料: * 1 http://blog.csdn.net/lfdfhl/article/details/18913435 * 2 http://blog.csdn.net/lfdfhl/article/details/9299075 * 3 http://rocye.iteye.com/blog/1258936 *   Thank you very much *    * 如果在某个线性布局中动态添加一个控件,并且想让该控件在布局中居中. * 也可采用createProgressBar()方法中类似的方式 * */public class MainActivity extends Activity {private Context mContext;private ProgressBar mProgressBar;    private ProgressDialog mProgressDialog;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//显示ProgressBarcreateProgressBar();//显示ProgressDialog//createProgressDialog();}private void createProgressBar(){mContext=this;//整个Activity布局的最终父布局,参见参考资料FrameLayout rootFrameLayout=(FrameLayout) findViewById(android.R.id.content);FrameLayout.LayoutParams layoutParams=    new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);layoutParams.gravity=Gravity.CENTER;mProgressBar=new ProgressBar(mContext);mProgressBar.setLayoutParams(layoutParams);mProgressBar.setVisibility(View.VISIBLE);rootFrameLayout.addView(mProgressBar);}private void createProgressDialog(){mContext=this;mProgressDialog=new ProgressDialog(mContext);mProgressDialog.setMessage("...请您稍等...");mProgressDialog.show();}}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"   >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="在屏幕中间位置显示ProgressDialog和ProgressBar"        android:layout_centerHorizontal="true" /></RelativeLayout>

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