Android自定义加载中Dialog

开发中经常需要请求网络获取数据，我们在请求网络到得到数据时当中需要等待一些时间，为了增加用户体验，我们一般会用一个Dialog来提示用户我们在加载网络数据。今天我们来实现如下效果的加载中Dialog。

从图中我们可以看到要这个Dialog是图片还有文字组成的，(不过我这里使用代码实现的，没有用图片)，以下是这个加载图形的代码：

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代码：

public class LoadingDialog { LVCircularRing mLoadingView; Dialog mLoadingDialog;  public LoadingDialog(Context context,String msg) {     // 首先得到整个View     View view = LayoutInflater.from(context).inflate(             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代码：

<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>

如何使用：在需要使用的地方初始化Dialog:

LoadingDialog dialog=new LoadingDialog(context,"玩命加载中..."); //显示Dialog dialog.show(); //关闭Dialog dialog.close();