第9例：带图标的信息提示弹框

核心思想知识点：
1）、自定义Toast
2）、build构建者模式
3）、Rxbinding、butterknife的使用

效果图如下

GIF.gif

功能实现过程

1、build.gradle

image.png

image.png

2、BackgroundDrawable.java（设置弹框的背景颜色、圆角等）

public class BackgroundDrawable extends Drawable{

    private static final String TAG = BackgroundDrawable.class.getSimpleName();
    private Paint paint;
    private Context mContext;
    public BackgroundDrawable(@ColorInt int color,Context context) {
        mContext = context.getApplicationContext();
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setDither(true);
        paint.setStyle(Paint.Style.FILL);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void draw(Canvas canvas) {
        Log.d(TAG,"draw===============");
        int width = canvas.getWidth();
        int height = canvas.getHeight();
        Log.d(TAG,"width==============="+width);
        Log.d(TAG,"height==============="+height);
        canvas.drawRoundRect(0,0,width,height,dp2px(20),dp2px(20),paint);
    }

    @Override
    public void setAlpha(int alpha) {
        Log.d(TAG,"setAlpha===============");
        paint.setAlpha(alpha);
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        Log.d(TAG,"setColorFilter===============");
        paint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        Log.d(TAG,"getOpacity===============");
        return PixelFormat.TRANSLUCENT;
    }

    private int dp2px(int values){
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,values,
                mContext.getResources().getDisplayMetrics());
    }
}

3、toast_layout.xml（弹框布局文件）

4、MyToast.java（自定义Toast）

public final class MyToast {

    public final Toast toast;//Toast对象
    public final View view;//Toast的UI效果
    public final ImageView icon;//图标
    public final TextView message;//内容

    private MyToast(Context context) {
        toast = new Toast(context);
        view = LayoutInflater.from(context).inflate(R.layout.toast_layout,null);
        icon = (ImageView) view.findViewById(R.id.toast_icon);
        message = (TextView) view.findViewById(R.id.toast_message);
    }

    /**
     * 显示
     */
    public void show(){
        this.toast.show();
    }

    public static class Builder{
        private Bitmap icon;//图标图片
        private int iconID = R.mipmap.ic_launcher;//图标资源ID
        private String message;//内容
        private int backgroundColor = 0x56000000;//背景颜色
        private Context mContext;//上下文
        private int duration = Toast.LENGTH_SHORT;//设置时间
        private MyToast mine;
        private int gravity = Gravity.NO_GRAVITY;//设置位置
        private int offsetX = 0;//设置偏移度X
        private int offsetY = 0;//设置偏移度Y
        private boolean isShowIcon;//是否显示图标
        public Builder(Context context) {
            this.mContext = context;
        }
        /**
         * 设置ICON
         * @param bitmap
         * @return
         */
        public Builder setIcon(Bitmap bitmap){
            this.icon = bitmap;
            return this;
        }
        public Builder setIcon(@DrawableRes int resId){
            this.iconID = resId;
            return this;
        }

        public Builder showIcon(boolean showIcon){
            this.isShowIcon = showIcon;
            return this;
        }
        /**
         * 设置内容
         */
        public Builder setMessage(String hintMessage){
            this.message = hintMessage;
            return this;
        }

        /**
         * 设置吐司时长
         */
        public Builder setDuration(int type){
            this.duration = type;
            return this;
        }
        /**
         * 设置背景
         */
        public Builder setBackgroundColor(@ColorInt int color){
            this.backgroundColor = color;
            return this;
        }
        /**
         * 设置位置
         */
        public Builder setGravity(int gravity){
            this.gravity = gravity;
            return this;
        }
        /**
         * 偏移量
         */
        public Builder setOffsetX(int x){
            this.offsetX = x;
            return this;
        }
        public Builder setOffsetY(int y){
            this.offsetY = y;
            return this;
        }
        /**
         * 创建MyToast对象
         */
        public MyToast build(){
            if (null == mine){
                mine = new MyToast(mContext);//创建对象
            }
            if (isShowIcon){
                //隐藏图标
                mine.icon.setVisibility(View.VISIBLE);
                if (null != icon){//判断是否显示图标
                    mine.icon.setImageBitmap(icon);//设置图片
                }else {
                    //设置图片
                    mine.icon.setBackgroundResource(iconID);
                }
            }
            if (!message.isEmpty()){//判断内容是否为空
                mine.message.setText(message);
            }else {
                mine.message.setText("");
            }
            //设置背景
            mine.view.setBackground(new BackgroundDrawable(backgroundColor,mContext));
            mine.toast.setDuration(duration);//设置时长
            mine.toast.setView(mine.view);//添加自定义效果
            mine.toast.setGravity(gravity,offsetX,offsetY);//设置偏移量
            return mine;
        }
    }

}

5、MainActivity.java（Toast的创建使用）

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.hint_toast)
    Button hintToast;
    private MyToast myToast;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        //创建Toast
        myToast = new MyToast.Builder(this)
                .setMessage("自定义Toast效果！")//设置提示文字
                .setBackgroundColor(0xe9ff4587)//设置背景颜色
                .setGravity(Gravity.CENTER)//设置吐司位置
                .showIcon(true)//是否显示图标
                .build();//创建吐司
        //按钮的点击事件
        RxView.clicks(hintToast)
                .throttleFirst(2, TimeUnit.SECONDS)
                .subscribe(aVoid -> myToast.show());
    }
}