建立自定義進度對話方塊

通過建立自定義進度對話方塊類，可以使用該對話方塊在 UI 例項中顯示，而無需重新建立對話方塊。

首先建立自定義進度對話方塊類。

CustomProgress.java

public class CustomProgress {

   public static CustomProgress customProgress = null;
   private Dialog mDialog;

   public static CustomProgress getInstance() {
       if (customProgress == null) {
           customProgress = new CustomProgress();
       }
       return customProgress;
   }

   public void showProgress(Context context, String message, boolean cancelable) {
       mDialog = new Dialog(context);
    // no tile for the dialog
       mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
       mDialog.setContentView(R.layout.prograss_bar_dialog);
       mProgressBar = (ProgressBar) mDialog.findViewById(R.id.progress_bar);
    //  mProgressBar.getIndeterminateDrawable().setColorFilter(context.getResources()
    // .getColor(R.color.material_blue_gray_500), PorterDuff.Mode.SRC_IN);
       TextView progressText = (TextView) mDialog.findViewById(R.id.progress_text);
       progressText.setText("" + message);
       progressText.setVisibility(View.VISIBLE);
       mProgressBar.setVisibility(View.VISIBLE);
    // you can change or add this line according to your need
       mProgressBar.setIndeterminate(true);
       mDialog.setCancelable(cancelable);
       mDialog.setCanceledOnTouchOutside(cancelable);
       mDialog.show();
   }

   public void hideProgress() {
       if (mDialog != null) {
           mDialog.dismiss();
           mDialog = null;
       }
   }
}

現在建立自定義進度佈局

prograss_bar_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="65dp"
    android:background="@android:color/background_dark"
    android:orientation="vertical">

    <TextView
        android:id="@+id/progress_text"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_above="@+id/progress_bar"
        android:layout_marginLeft="10dp"
        android:layout_marginStart="10dp"
        android:background="@android:color/transparent"
        android:gravity="center_vertical"
        android:text=""
        android:textColor="@android:color/white"
        android:textSize="16sp"
        android:visibility="gone" />

    <-- Where the style can be changed to any kind of ProgressBar -->

    <ProgressBar
        android:id="@+id/progress_bar"
        style="@android:style/Widget.DeviceDefault.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_gravity="center"
        android:background="@color/cardview_dark_background"
        android:maxHeight="20dp"
        android:minHeight="20dp" />

</RelativeLayout>

就是這個。現在呼叫 Code 中的 Dialog

CustomProgress customProgress = CustomProgress.getInstance();

// now you have the instance of CustomProgres
// for showing the ProgressBar

customProgress.showProgress(#Context, getString(#StringId), #boolean);

// for hiding the ProgressBar

customProgress.hideProgress();