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;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//显示ProgressBar
createProgressBar();
//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>
