Android最简单的LoadingDialog

节选自：Android最简单的LoadingDialog

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Activity的基类

public class BaseAcitivity extends Activity {

    private AlertDialog alertDialog;

    public void showLoadingDialog() {
        alertDialog = new AlertDialog.Builder(this).create();
        alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable());
        alertDialog.setCancelable(false);
        alertDialog.show();
        alertDialog.setContentView(R.layout.loading_alert);
        alertDialog.setCanceledOnTouchOutside(false);
    }

    public void dismissLoadingDialog() {
        if (null != alertDialog && alertDialog.isShowing()) {
            alertDialog.dismiss();
        }
    }
}

XML：loading_alert

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent">

    <ProgressBar
        style="@style/AppTheme.NoActionBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_gravity="center_horizontal" />

</RelativeLayout>

在styles.xml中添加

<style name="AppTheme.NoActionBar">
    <item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>
</style>