Android Loading加载动画

1.创建一个工具类LoaringDialog

public class LoadingDialog extends Dialog {
    private ImageView iv_ing;
    private AnimationSet animationSet;
 
    private static LoadingDialog instance;
 
    public static LoadingDialog getInstance(Context context) {
        if(instance == null) {
            instance = new LoadingDialog(context);
        }
 
        return instance;
    }
 
  public static void setInstance(LoadingDialog instance) {
        LoadingDialog.instance = instance;
    }
 
    private LoadingDialog(@NonNull Context context) {
        super(context);
    }
 
    private LoadingDialog(@NonNull Context context, @StyleRes int themeResId) {
        super(context, themeResId);
    }
 
    private LoadingDialog(@NonNull Context context, boolean cancelable, @Nullable OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        //背景透明处理
        getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
        getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        getWindow().setDimAmount(0f);
 
        this.setContentView(R.layout.dialog_loading);
 
        //设置dialog属性
        setCancelable(true);
        setCanceledOnTouchOutside(false);
 
        iv_ing = findViewById(R.id.iv_ing);
 
        //加载动画
        loadIng();
    }
 
    @Override
    protected void onStart() {
        super.onStart();
        iv_ing.startAnimation(animationSet);//开始播放
    }
 
    @Override
    protected void onStop() {
        super.onStop();
    }
 
    //加载动画
    private void loadIng() {
        animationSet = new AnimationSet(true);
        RotateAnimation animation_rotate = new RotateAnimation(0, +359,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        //第一个参数fromDegrees为动画起始时的旋转角度 //第二个参数toDegrees为动画旋转到的角度
        //第三个参数pivotXType为动画在X轴相对于物件位置类型 //第四个参数pivotXValue为动画相对于物件的X坐标的开始位置
        //第五个参数pivotXType为动画在Y轴相对于物件位置类型 //第六个参数pivotYValue为动画相对于物件的Y坐标的开始位置
        animation_rotate.setRepeatCount(-1);
        animation_rotate.setStartOffset(0);
        animation_rotate.setDuration(1000);
        LinearInterpolator lir = new LinearInterpolator();
        animationSet.setInterpolator(lir);
        animationSet.addAnimation(animation_rotate);
    }
}

2.dialog_loading布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_body"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#00000000"
    android:orientation="horizontal"
    android:padding="10dp">
 
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
 
<!--        <ImageView-->
<!--            android:layout_width="wrap_content"-->
<!--            android:layout_height="wrap_content"-->
<!--            android:layout_centerInParent="true"-->
<!--            android:src="@drawable/ic_loading_ing" />-->
 
<!--        <ImageView-->
<!--            android:layout_width="50dp"-->
<!--            android:layout_height="50dp"-->
<!--            android:layout_centerInParent="true"-->
<!--            android:src="@drawable/ic_loading_logo" />-->
 
        <ImageView
            android:id="@+id/iv_ing"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:layout_centerInParent="true"
            android:src="@drawable/ic_loading" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="正在加载中..."
            android:layout_below="@+id/iv_ing"
            android:layout_marginTop="20dp"/>
    </RelativeLayout>
</LinearLayout>

3.调用

LoadingDialog.getInstance(this).show();//显示
 
LoadingDialog.getInstance(context).hide();//隐藏
 
 
销毁当前页面后
LoadingDialog.setInstance(null);//设置为空 然会报错