一个转圈读取中的读取中Dialog_lvcircularring-优快云博客

本文介绍了一种自定义加载对话框的实现方法，通过创建LVCircularRing类继承View来绘制旋转的圆环，并结合Dialog展示加载提示。文章详细展示了如何通过代码控制圆环的旋转动画以及Dialog的显示与关闭。

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转圈的圆是用代码写的

public class LVCircularRing extends View {
    private float mWidth = 0f;
    private float mPadding = 0f;
    private float startAngle = 0f;
    private Paint mPaint;

    public LVCircularRing(Context context) {
        this(context, null);
    }

    public LVCircularRing(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public LVCircularRing(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initPaint();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if (getMeasuredWidth() > getHeight())
            mWidth = getMeasuredHeight();
        else
            mWidth = getMeasuredWidth();
        mPadding = 5;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        mPaint.setColor(Color.argb(100, 255, 255, 255));
        canvas.drawCircle(mWidth / 2, mWidth / 2, mWidth / 2 - mPadding, mPaint);
        mPaint.setColor(Color.WHITE);
        RectF rectF = new RectF(mPadding, mPadding, mWidth - mPadding, mWidth - mPadding);
        canvas.drawArc(rectF, startAngle, 100
                , false, mPaint);//第四个参数是否显示半径

    }


    private void initPaint() {
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(Color.WHITE);
        mPaint.setStrokeWidth(8);
    }

    public void startAnim() {
        stopAnim();
        startViewAnim(0f, 1f, 1000);
    }

    public void stopAnim() {
        if (valueAnimator != null) {
            clearAnimation();
            valueAnimator.setRepeatCount(1);
            valueAnimator.cancel();
            valueAnimator.end();
        }
    }

    ValueAnimator valueAnimator;

    private ValueAnimator startViewAnim(float startF, final float endF, long time) {
        valueAnimator = ValueAnimator.ofFloat(startF, endF);

        valueAnimator.setDuration(time);
        valueAnimator.setInterpolator(new LinearInterpolator());
        valueAnimator.setRepeatCount(ValueAnimator.INFINITE);//无限循环
        valueAnimator.setRepeatMode(ValueAnimator.RESTART);//

        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {

                float value = (float) valueAnimator.getAnimatedValue();
                startAngle = 360 * value;

                invalidate();
            }
        });
        valueAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
            }
        });
        if (!valueAnimator.isRunning()) {
            valueAnimator.start();
        }

        return valueAnimator;
    }
}

Dialog类

public class LoadingDialog {
    LVCircularRing mLoadingView;
    Dialog mLoadingDialog;

    public LoadingDialog(Context context, String msg) {
        // 首先得到整个View
        View view = View.inflate(context, R.layout.loading_dialog_view, null);
        // 获取整个布局
        LinearLayout layout = (LinearLayout) view.findViewById(R.id.dialog_view);
        // 页面中的LoadingView
        mLoadingView = (LVCircularRing) view.findViewById(R.id.lv_circularring);
        // 页面中显示文本
        TextView loadingText = (TextView) view.findViewById(R.id.loading_text);
        // 显示文本
        loadingText.setText(msg);
        // 创建自定义样式的Dialog
        mLoadingDialog = new Dialog(context, R.style.loading_dialog);
        // 设置返回键无效
        mLoadingDialog.setCancelable(false);
        mLoadingDialog.setContentView(layout, new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT));
    }

    public void show() {
        mLoadingDialog.show();
        mLoadingView.startAnim();
    }

    public void close() {
        if (mLoadingDialog != null) {
            mLoadingView.stopAnim();
            mLoadingDialog.dismiss();
            mLoadingDialog = null;
        }
    }
}

布局文件loading_dialog_view代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dialog_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:background="@drawable/dialog_bg"
android:padding="20dp"
android:orientation="vertical">

<com.ye.daqiapp.ui.widget.loading.LVCircularRing
    android:id="@+id/lv_circularring"
    android:layout_width="50dp"
    android:layout_height="50dp"/>

<TextView
    android:id="@+id/loading_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#ffffff"
    android:layout_marginTop="5dp"
    android:textSize="15sp"/>

</LinearLayout>

Dialog中Style

<style name="loading_dialog" parent="android:style/Theme.Dialog">
    <item name="android:windowFrame">@null</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:backgroundDimEnabled">false</item>
    <item name="android:windowContentOverlay">@null</item>
</style>

背景dialog_bg代码

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 内部颜色 -->
<solid android:color="#444444" />

<!-- 圆角的幅度 -->
<corners
    android:bottomLeftRadius="3dp"
    android:bottomRightRadius="3dp"
    android:topLeftRadius="3dp"
    android:topRightRadius="3dp" />
</shape>

使用

LoadingDialog dialog=new LoadingDialog(context,"玩命加载中...");

//显示Dialog

dialog.show();

//关闭Dialog

dialog.close();