安卓自定义简单loading

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.Window;
import android.view.WindowManager;
/**主要的loading对话框
*/
public class DefaultLoadingDialog extends AlertDialog {

    private int layoutId;


    public Context context;




    public DefaultLoadingDialog(Context context) {
        super(context);
        this.context = context;
    }


    @SuppressLint("ResourceType")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        layoutId = R.layout.loading_alert;

        setContentView(layoutId);


//       ((View)bar.getParent().getParent().getParent()).setBackgroundColor(Color.LTGRAY);
        /**设置透明度*/
        Window window = getWindow();
        WindowManager.LayoutParams lp = window.getAttributes();
        lp.alpha = 1f;// 透明度
        lp.dimAmount = 0f;// 黑暗度

        //这两行，处理部分机型不对称居中的问题
        lp.width = (int) (context.getResources().getDisplayMetrics().widthPixels * 0.95); // 宽度设置为屏幕的0.95
        lp.gravity = Gravity.CENTER;//设置位置


        window.setAttributes(lp);

         window.getDecorView().setBackgroundResource(Color.TRANSPARENT);


        setCanceledOnTouchOutside(false);
        setCancelable(false);

    }


}

布局文件loading_alert.xml：

<?xml version="1.0" encoding="utf-8"?>
<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
        android:id="@+id/progressBar1"
        style="@style/AppTheme.NoActionBar"
        android:layout_width="50dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_gravity="center_horizontal"
        android:indeterminateDrawable="@drawable/loadingbar" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/progressBar1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="@string/brvah_loading"
        android:textColor="@color/font_dark_gray"
        android:visibility="gone"

        />

</RelativeLayout>

加载loainng样式:

loadingbar.xml

<?xml version="1.0" encoding="utf-8"?>
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360">
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="8"
        android:useLevel="false">
        <gradient
            android:centerColor="#7f919191"
            android:centerY="0.50"
            android:endColor="#00919191"
            android:startColor="#ff919191"
            android:type="sweep"
            android:useLevel="false" />
    </shape>
</animated-rotate>

使用：

DefaultProgressDialog mDefaultProgressDialog;

if (mDefaultLoadingDialog == null)
    mDefaultLoadingDialog = new DefaultLoadingDialog(mContext);

mDefaultProgressDialog.show();

if (mDefaultLoadingDialog != null) {
    mDefaultLoadingDialog.dismiss();
    mDefaultLoadingDialog = null;
}