Android应用程序中加载进度设计

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Android在加载数据（访问数据库或者加载网络数据），需要显示加载进度，其实这个非常简单！

1.加载数据进度显示的XML布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent">
<LinearLayout android:background="@drawable/alert" android:layout_gravity="center" android:paddingLeft="10dip" android:paddingRight="10dip" android:paddingTop="20dip" android:paddingBottom="20dip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" >
  <ProgressBar
   android:id="@android:id/progress"
   android:layout_marginRight="15dip"
   android:layout_gravity="center_vertical|right"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:progressDrawable="@drawable/white"
   style="?android:attr/progressBarStyleSmall">
  </ProgressBar>
  <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@android:id/text1" android:textColor="#fff" android:text="正在加载..."></TextView>
</LinearLayout>
</FrameLayout>

2.加载数据的进度显示类

public class LoadingAlert {
private View mView;
private TextView mText;
public LoadingAlert(Activity activity) {
  mView=LayoutInflater.from(activity).inflate(R.layout.loadingalert, null);
  mText=(TextView) mView.findViewById(android.R.id.text1);
  LinearLayout.LayoutParams lay=new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
  lay.gravity=Gravity.CENTER;
  activity.addContentView(mView, lay);
}

public LoadingAlert(Dialog dialog) {
  mView=dialog.getLayoutInflater().inflate(R.layout.loadingalert, null);
  mText=(TextView) mView.findViewById(android.R.id.text1);
  ViewGroup.LayoutParams lay=new ViewGroup.LayoutParams(dialog.getWindow().peekDecorView().getWidth(), dialog.getWindow().peekDecorView().getHeight());
  dialog.addContentView(mView, lay);
}

public void setMessage(String message){
  mText.setText(message);
}

public void hide(){
  mView.setVisibility(View.GONE);
}

public void show(){
  mView.setVisibility(View.VISIBLE);
}