public class Loading_view extends ProgressDialog {
public Loading_view(Context context) {
super(context);
}

public Loading_view(Context context, int theme) {
super(context, theme);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

init(getContext());
}

private void init(Context context) {
setCancelable(true);
setCanceledOnTouchOutside(false);

setContentView(R.layout.loading);//loading的xml文件
WindowManager.LayoutParams params = getWindow().getAttributes();
params.width = WindowManager.LayoutParams.WRAP_CONTENT;
params.height = WindowManager.LayoutParams.WRAP_CONTENT;
getWindow().setAttributes(params);
}

@Override
public void show() {//开启
super.show();
}

@Override
public void dismiss() {//关闭
super.dismiss();
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"
android:background="@drawable/shape_dialog_bg"//背景色
android:layout_centerInParent="true"
android:orientation="vertical">

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp">

<ProgressBar
android:id="@+id/pb_load"
android:layout_width="65dp"
android:layout_height="65dp"
android:indeterminateDrawable="@drawable/progressbar"//加载圈的样式
android:layout_centerInParent="true"/>

</RelativeLayout>

<TextView
android:id="@+id/tv_load_dialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="加载中..."
android:textColor="#9a9b98"
android:textSize="12sp"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

<corners android:radius="8dp" />
<solid android:color="#88000000" />
</shape>

<animated-rotate
xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%"
android:fromDegrees="0"
android:toDegrees="720">

<shape
android:shape="ring"
android:innerRadiusRatio="3"
android:thicknessRatio="15"
android:useLevel="false">
<gradient
android:type="sweep"
android:useLevel="false"
android:startColor="#55c6c6c6"
android:centerColor="#c6c6c6"
android:centerY="0.50"
android:endColor="#c6c6c6" />
</shape>

</animated-rotate>

public class MainActivity extends AppCompatActivity {

private Loading_view loading;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

}


public void loding(View v){//点击加载并按钮模仿网络请求

loading = new Loading_view(this,R.style.CustomDialog);
loading.show();
new Handler().postDelayed(new Runnable() {//定义延时任务模仿网络请求
@Override
public void run() {
loading.dismiss();//3秒后调用关闭加载的方法
}
}, 3000);
}
}

<style name="CustomDialog" parent="Theme.AppCompat.Dialog">
<item name="android:backgroundDimEnabled">false</item>
<item name="android:windowBackground">@android:color/transparent</item>
</style>