Android实现加载圈

import android.app.Dialog;
import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
 
 
public class CircularLoading {
/**
* 显示Dialog
* @param context 上下文对象
* @param msg 提示内容
* @param isCancelable 是否可以点击取消
* @return
*/
public static Dialog showLoadDialog(Context context, String msg, boolean isCancelable) {
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.circular_loading, null);
RelativeLayout layout = (RelativeLayout) v.findViewById(R.id.dialog_bg);
 
// main.xml中的ImageView
ImageView loadImage = (ImageView) v.findViewById(R.id.load_iv);
TextView pointTextView = (TextView) v.findViewById(R.id.point_tv);
// 加载动画
Animation hyperspaceJumpAnimation = AnimationUtils.loadAnimation(context, R.anim.rotating_animation);
// 使用ImageView显示动画
loadImage.startAnimation(hyperspaceJumpAnimation);
pointTextView.setText(msg);
Dialog loadingDialog = new Dialog(context, R.style.TransDialogStyle);
loadingDialog.setContentView(layout);
loadingDialog.setCancelable(isCancelable);
loadingDialog.setCanceledOnTouchOutside(false);
 
 
Window window = loadingDialog.getWindow();
WindowManager.LayoutParams lp = window.getAttributes();
lp.width = WindowManager.LayoutParams.WRAP_CONTENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
window.setGravity(Gravity.CENTER);
window.setAttributes(lp);
window.setWindowAnimations(R.style.PopWindowAnimStyle);
loadingDialog.show();
return loadingDialog;
}
 
/**
* 关闭dialog
*/
public static void closeDialog(Dialog mCircularLoading) {
if (mCircularLoading != null && mCircularLoading.isShowing()) {
mCircularLoading.dismiss();
}
}
 
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dialog_bg"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000000"
    android:minHeight="60dp"
    android:minWidth="150dp"
    android:orientation="horizontal" >
    <ImageView
        android:id="@+id/load_iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="20dp"
        android:layout_marginStart="20dp"
        android:src="@drawable/dialog_loading_img" />
    <TextView
        android:id="@+id/point_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="0dp"
        android:layout_toRightOf="@+id/load_iv"
        android:ellipsize="middle"
        android:singleLine="true"
        android:textSize="16sp" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/linear_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="-1"
        android:repeatMode="restart"
        android:toDegrees="360" />

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:fromAlpha="0"
        android:toAlpha="1.0"/>
 
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="1.0"
    android:toAlpha="0"/>
</set>

</style>
        <style name="TransDialogStyle" parent="@android:style/Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:background">@android:color/transparent</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:backgroundDimAmount">0.5</item>
        <item name="android:windowFullscreen">true</item>
 
    </style>
 
    </style>
        <style name="PopWindowAnimStyle">
        <item name="android:windowShowAnimation">@anim/dialog_show</item>
        <item name="android:windowHideAnimation">@anim/dialog_hide</item>
</style>

//显示
mCircularLoading = CircularLoading.showLoadDialog(Dvr_Activity_Main.this, "加载中...", true);
 
//关闭
CircularLoading.closeDialog(mCircularLoading);