Java SurfaceView显示除图标外的黑屏_Java_Android

Java SurfaceView显示除图标外的黑屏

java android

Java SurfaceView显示除图标外的黑屏,java,android,Java,Android,我使用了旧的指南，根据该指南，图标应该出现在surfaceview中不幸的是，该应用程序显示除图标外的整个黑色表面视图。我不知道知道如何修复此问题，因为android studio不会显示错误。我应该添加或更改什么 public class mySurfaceView extends SurfaceView { private SurfaceHolder surfaceHolder; private Bitmap bmpIcon; pu

我使用了旧的指南，根据该指南，图标应该出现在surfaceview中

不幸的是，该应用程序显示除图标外的整个黑色表面视图。我不知道知道如何修复此问题，因为android studio不会显示错误。我应该添加或更改什么

public class mySurfaceView extends SurfaceView {

        private SurfaceHolder surfaceHolder;
        private Bitmap bmpIcon;

        public mySurfaceView(Context context) {
            super(context);
            init();
        }

        public mySurfaceView(Context context,
                             AttributeSet attrs) {
            super(context, attrs);
            init();
        }

        public mySurfaceView(Context context,
                             AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            init();
        }

        private void init(){
            surfaceHolder = getHolder();
            bmpIcon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.icon);
            surfaceHolder.addCallback(new SurfaceHolder.Callback(){

                @Override
                public void surfaceCreated(SurfaceHolder holder) {
                    Canvas canvas = holder.lockCanvas(null);
                    drawSomething(canvas);
                    holder.unlockCanvasAndPost(canvas);
                }

                @Override
                public void surfaceChanged(SurfaceHolder holder,
                                           int format, int width, int height) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
                    // TODO Auto-generated method stub

                }});
        }

        protected void drawSomething(Canvas canvas) {
            canvas.drawColor(Color.BLACK);
    if (bmpIcon != null){        canvas.drawBitmap(bmpIcon,
                    getWidth()/2, getHeight()/2, null);
        }


        }

    }

我的偶像

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF020000"
        android:pathData="M6,18c0,0.55 0.45,1 1,1h1v3.5c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5L11,19h2v3.5c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5L16,19h1c0.55,0 1,-0.45 1,-1L18,8L6,8v10zM3.5,8C2.67,8 2,8.67 2,9.5v7c0,0.83 0.67,1.5 1.5,1.5S5,17.33 5,16.5v-7C5,8.67 4.33,8 3.5,8zM20.5,8c-0.83,0 -1.5,0.67 -1.5,1.5v7c0,0.83 0.67,1.5 1.5,1.5s1.5,-0.67 1.5,-1.5v-7c0,-0.83 -0.67,-1.5 -1.5,-1.5zM15.53,2.16l1.3,-1.3c0.2,-0.2 0.2,-0.51 0,-0.71 -0.2,-0.2 -0.51,-0.2 -0.71,0l-1.48,1.48C13.85,1.23 12.95,1 12,1c-0.96,0 -1.86,0.23 -2.66,0.63L7.85,0.15c-0.2,-0.2 -0.51,-0.2 -0.71,0 -0.2,0.2 -0.2,0.51 0,0.71l1.31,1.31C6.97,3.26 6,5.01 6,7h12c0,-1.99 -0.97,-3.75 -2.47,-4.84zM10,5L9,5L9,4h1v1zM15,5h-1L14,4h1v1z"/>
</vector>

您在

drawSomething

方法中给出了黑色，如果更改颜色，您的背景将更改

protected void drawSomething(Canvas canvas) {
        //canvas.drawColor(Color.BLACK);
        canvas.drawColor(Color.RED); // here i changed black to red(add you expected color here)
        if (bmpIcon != null) {
            canvas.drawBitmap(bmpIcon,
                    getWidth() / 2, getHeight() / 2, null);
        }

    }

由于您的绘图是矢量绘图，所以使用以下函数将其转换为位图

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            drawable = (DrawableCompat.wrap(drawable)).mutate();
        }

        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
                drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }

它会很好用的

最后的代码是这样的

public class MySurface extends SurfaceView {

    private SurfaceHolder surfaceHolder;
    private Bitmap bmpIcon;

    public MySurface(Context context) {
        super(context);
        init();
    }

    public MySurface(Context context,
                     AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MySurface(Context context,
                     AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            drawable = (DrawableCompat.wrap(drawable)).mutate();
        }

        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
                drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }

    private void init() {
        surfaceHolder = getHolder();

        bmpIcon = getBitmapFromVectorDrawable(getContext(), R.drawable.icon);
        surfaceHolder.addCallback(new SurfaceHolder.Callback() {

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                Canvas canvas = holder.lockCanvas(null);
                drawSomething(canvas);
                holder.unlockCanvasAndPost(canvas);
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder,
                                       int format, int width, int height) {
                // TODO Auto-generated method stub

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                // TODO Auto-generated method stub

            }
        });
    }

    protected void drawSomething(Canvas canvas) {
        canvas.drawColor(Color.RED);
        if (bmpIcon != null) {
            canvas.drawBitmap(bmpIcon,
                    getWidth() / 2, getHeight() / 2, null);
        }

    }

}

public类MySurface扩展了SurfaceView{
私人地勤人员地勤人员；
私有位图bmpIcon；
公共MySurface（上下文）{
超级（上下文）；
init（）；
}
公共MySurface（上下文，
属性集（属性）{
超级（上下文，attrs）；
init（）；
}
公共MySurface（上下文，
属性集属性，int defStyle）{
超级（上下文、属性、定义样式）；
init（）；
}
公共静态位图getBitmapFromVectorDrawable（上下文上下文，int-drawableId）{
Drawable Drawable=ContextCompat.getDrawable（上下文，drawableId）；
if（Build.VERSION.SDK\u INT


您在drawSomething
方法中给出了黑色，如果更改颜色，您的背景将更改
protected void drawSomething(Canvas canvas) {
        //canvas.drawColor(Color.BLACK);
        canvas.drawColor(Color.RED); // here i changed black to red(add you expected color here)
        if (bmpIcon != null) {
            canvas.drawBitmap(bmpIcon,
                    getWidth() / 2, getHeight() / 2, null);
        }

    }

由于您的绘图是矢量绘图，所以使用以下函数将其转换为位图
public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            drawable = (DrawableCompat.wrap(drawable)).mutate();
        }

        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
                drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }

它会很好用的
最后的代码是这样的
public class MySurface extends SurfaceView {

    private SurfaceHolder surfaceHolder;
    private Bitmap bmpIcon;

    public MySurface(Context context) {
        super(context);
        init();
    }

    public MySurface(Context context,
                     AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MySurface(Context context,
                     AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            drawable = (DrawableCompat.wrap(drawable)).mutate();
        }

        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
                drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }

    private void init() {
        surfaceHolder = getHolder();

        bmpIcon = getBitmapFromVectorDrawable(getContext(), R.drawable.icon);
        surfaceHolder.addCallback(new SurfaceHolder.Callback() {

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                Canvas canvas = holder.lockCanvas(null);
                drawSomething(canvas);
                holder.unlockCanvasAndPost(canvas);
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder,
                                       int format, int width, int height) {
                // TODO Auto-generated method stub

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                // TODO Auto-generated method stub

            }
        });
    }

    protected void drawSomething(Canvas canvas) {
        canvas.drawColor(Color.RED);
        if (bmpIcon != null) {
            canvas.drawBitmap(bmpIcon,
                    getWidth() / 2, getHeight() / 2, null);
        }

    }

}

public类MySurface扩展了SurfaceView{
私人地勤人员地勤人员；
私有位图bmpIcon；
公共MySurface（上下文）{
超级（上下文）；
init（）；
}
公共MySurface（上下文，
属性集（属性）{
超级（上下文，attrs）；
init（）；
}
公共MySurface（上下文，
属性集属性，int defStyle）{
超级（上下文、属性、定义样式）；
init（）；
}
公共静态位图getBitmapFromVectorDrawable（上下文上下文，int-drawableId）{
Drawable Drawable=ContextCompat.getDrawable（上下文，drawableId）；
if（Build.VERSION.SDK\u INT

 
但是这个表面应该显示R.Dabable图标，检查In（）方法是，它将显示在你的表面中间。我将在我的回答中添加输出的屏幕截图哇，你是怎么做到的？我在我的第一个问题“检查，我没有图标”中添加了手机屏幕/什么是你的图标颜色，如果它的阅读改变一些其他图标和检查。图标是黑色的：“Android：FiffCu色光=”yff002”，但是这个表面应该显示R.Dababel.Ictudio，Chin In（）方法，是的，它将显示在你的表面中间。我将在我的回答中添加输出的屏幕截图哇，你是怎么做到的？我将手机屏幕添加到了第一个屏幕