网络等待Loading图
Loading.gif
刚开始做这种效果是用xml来画圆形实心点的。 白色圆点
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
android:shape="oval" >
<corners android:radius="8dp"/>
<solid android:color="#fffdf8"/>
</shape>
灰色圆点
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
android:shape="oval" >
<corners android:radius="8dp"/>
<solid android:color="#7ffffdf8"/>
</shape>
Loading布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="60dp"
android:layout_height="50dp"
android:background="@drawable/toast_error_network_bg"
android:orientation="horizontal"
android:gravity="center">
<ImageView
android:id="@+id/iv_dot1"
android:layout_width="5dp"
android:layout_height="5dp"
android:background="@drawable/dot_unfocus"/>
<ImageView
android:id="@+id/iv_dot2"
android:layout_width="5dp"
android:layout_height="5dp"
android:layout_marginLeft="5dp"
android:background="@drawable/dot_unfocus"/>
<ImageView
android:id="@+id/iv_dot3"
android:layout_width="5dp"
android:layout_height="5dp"
android:layout_marginLeft="5dp"
android:background="@drawable/dot_unfocus"/>
</LinearLayout>
使用Timer来修改background
Timer mTimer = new Timer();
mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if(mPosition ==1) {
mIvDot1.setBackgroundResource(R.drawable.dot_focus);
mIvDot2.setBackgroundResource(R.drawable.dot_unfocus);
mIvDot3.setBackgroundResource(R.drawable.dot_unfocus);
mPosition = 2;
} else if(mPosition == 2) {
mIvDot1.setBackgroundResource(R.drawable.dot_unfocus);
mIvDot2.setBackgroundResource(R.drawable.dot_focus);
mIvDot3.setBackgroundResource(R.drawable.dot_unfocus);
mPosition = 3;
} else if(mPosition == 3) {
mIvDot1.setBackgroundResource(R.drawable.dot_unfocus);
mIvDot2.setBackgroundResource(R.drawable.dot_unfocus);
mIvDot3.setBackgroundResource(R.drawable.dot_focus);
mPosition = 1;
}
}
};
mTimer.schedule(new TimerTask() {
@Override
public void run() {
mHandler.sendEmptyMessage(0);
}
}, 0, 400);
这样也是可以达到上面那种效果的,但是总感觉这么写不太符合程序员的风格。。。所以就有了下面的这种写法。
public class LoadingPointView extends View {
public static final int MESSAGE_ID = 0;
//白色圆点
private Paint mWhitePaint;
//绿色圆点
private Paint mGreenPaint;
//半径
private int mRadius;
//下一个被选中的圆点的index
private int mIndex;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
++mIndex;
if (mIndex == 5) {
mIndex = 0;
}
postInvalidate();
}
};
public LoadingPointView(Context context) {
this(context, null);
}
public LoadingPointView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public LoadingPointView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initParmas(context);
}
private void initParmas(Context context) {
mWhitePaint = new Paint();
mWhitePaint.setAntiAlias(true);
mWhitePaint.setStyle(Paint.Style.FILL);
mWhitePaint.setColor(ContextCompat.getColor(context, R.color.white));
mGreenPaint = new Paint();
mGreenPaint.setAntiAlias(true);
mGreenPaint.setStyle(Paint.Style.FILL);
mGreenPaint.setColor(ContextCompat.getColor(context, R.color.c_3ec88e));
mPaintWidth = Px2DpUtil.dp2px(context, 2);
mCircleX = Px2DpUtil.dp2px(context, 40);
mCircleY = Px2DpUtil.dp2px(context, 40);
mRadius = Px2DpUtil.dp2px(context, 5);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (int i = 0; i < 5; i++) {
//修改圆心x轴坐标,来画出多个圆点
canvas.drawCircle(getHeight() / 2 + mRadius * i * 2 + 5 * i, getHeight() / 2, mRadius, mWhitePaint);
}
//动态修改绿色圆点的位置
canvas.drawCircle(getHeight() / 2 + mRadius * mIndex * 2 + 5 * mIndex, getHeight() / 2, mRadius, mGreenPaint);
//发送消息不断绘制,以达到无限循环的效果
mHandler.sendEmptyMessageDelayed(MESSAGE_ID, 200);
}
//停止动画
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mHandler.removeMessages(MESSAGE_ID);
mHandler = null;
}
}
使用方法
<cn.custom.widget.widget.LoadingPointView
android:id="@+id/id_loading_point_view"
android:layout_width="60dp"
android:layout_height="10dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>
具体效果和实现就是以上这些内容了。有什么问题可以评论。
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