Android分分钟教你写一个个性化的加载框

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闲来无事写的一个加载框，实现效果如下：
实现思路：
其实看样子就感觉很简单的...在自定义Relativelayout里用onDraw绘制就行了。
复习了一下以前学的知识。
代码实现：
package com.whale.nangua.toquan.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.Log;import android.view.LayoutInflater;import android.widget.RelativeLayout;import com.whale.nangua.toquan.R;/** * Created by nangua on 2016/8/10. */public class NGLoadDialog extends RelativeLayout {    float scale;    //像素密度    float height;     //控件高度    float with;       //控件宽度    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);        height = this.getHeight();        with = this.getWidth();        CIRCLE_R = with / 3 / 3 / 2;        float temp = CIRCLE_R/6;        CIRCLE_R1 = CIRCLE_R;        CIRCLE_R2 = CIRCLE_R - temp;        CIRCLE_R3 = CIRCLE_R - 2*temp;        CIRCLE_SPACE = 1 * scale;    }    public NGLoadDialog(Context context, AttributeSet attrs) {        super(context, attrs);        LayoutInflater.from(context).inflate(R.layout.dialog_load, this, true);        scale = context.getResources().getDisplayMetrics().density;       //获得像素密度        init();    }    private void init() {    }    private float CIRCLE_R; //球半径    private float CIRCLE_SPACE;//球间距    private float CIRCLE_R1;    //球1半径    private float CIRCLE_R2;    //球2半径    private float CIRCLE_R3;    //球3半径    private boolean CIRCLE_R1_STATE = true;    //球1状态，true缩小false增大    private boolean CIRCLE_R2_STATE = true;    //球2状态，true缩小false增大    private boolean CIRCLE_R3_STATE = true;    //球3状态，true缩小false增大    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint paint = new Paint();        paint.setColor(Color.WHITE);        paint.setAntiAlias(true);        paint.setStrokeWidth(CIRCLE_R);        paint.setStyle(Paint.Style.FILL);        //画三个圆        //第一个        canvas.drawCircle(with / 2 - 2 * CIRCLE_R - CIRCLE_SPACE,                height / 3,                CIRCLE_R1,                paint        );        if (CIRCLE_R1_STATE) {            CIRCLE_R1 = CIRCLE_R1 - 0.5f;            if (CIRCLE_R1 <= CIRCLE_R / 2) {                CIRCLE_R1_STATE = false;            }        } else {            CIRCLE_R1 = CIRCLE_R1 + 0.5f;            if (CIRCLE_R1 >= CIRCLE_R) {                CIRCLE_R1_STATE = true;            }        }        //第二个        canvas.drawCircle(with / 2,                height / 3,                CIRCLE_R2,                paint        );        if (CIRCLE_R2_STATE) {            CIRCLE_R2 = CIRCLE_R2 - 0.5f;            if (CIRCLE_R2 <= CIRCLE_R / 2) {                CIRCLE_R2_STATE = false;            }        } else {            CIRCLE_R2 = CIRCLE_R2 + 0.5f;            if (CIRCLE_R2 >= CIRCLE_R) {                CIRCLE_R2_STATE = true;            }        }        //第三个        canvas.drawCircle(with / 2 + 2 * CIRCLE_R + CIRCLE_SPACE,                height / 3,                CIRCLE_R3,                paint        );        if (CIRCLE_R3_STATE) {            CIRCLE_R3 = CIRCLE_R3 - 0.5f;            if (CIRCLE_R3 <= CIRCLE_R / 2) {                CIRCLE_R3_STATE = false;            }        } else {            CIRCLE_R3 = CIRCLE_R3 + 0.5f;            if (CIRCLE_R3 >= CIRCLE_R) {                CIRCLE_R3_STATE = true;            }        }        postInvalidateDelayed(30);    }}
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