Question

我正在尝试创建一个应用程序，当应用程序打开时，它将在后台显示不同的图像，但是当我尝试调用该方法时。我收到错误。我正在为api低于16制作模糊图像这是我使用的

public class MainActivity extends AppCompatActivity {
int roll[]={R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,R.drawable.img6};
int number;
private final Paint mPaint = new Paint();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Random num= new Random();
number=num.nextInt(6);
    ImageView img =(ImageView)findViewById(R.id.imageView);

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(),roll[number]);
    Bitmap blurredBitmap = blur(""+roll[number]);
    img.setImageBitmap(blurredBitmap);
}


public Bitmap blur(final String pathToBitmap) {
    final BitmapFactory.Options options = new BitmapFactory.Options();
    final Bitmap normalOne = BitmapFactory.decodeFile(pathToBitmap, options);
    final Bitmap resultBitmap = Bitmap.createBitmap(options.outWidth, options.outHeight, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(resultBitmap);
    mPaint.setAlpha(180);
    canvas.drawBitmap(normalOne, 0, 0, mPaint);
    int blurRadius = 12;
    for (int row = -blurRadius; row < blurRadius; row += 2) {
        for (int col = -blurRadius; col < blurRadius; col += 2) {
            if (col * col + row * row <= blurRadius * blurRadius) {
                mPaint.setAlpha((blurRadius * blurRadius) / ((col * col + row * row) + 1) * 2);
                canvas.drawBitmap(normalOne, row, col, mPaint);
            }
        }
    }
    normalOne.recycle();
    return resultBitmap;
}
}

我做错了什么？我正在使用这种方法，因为在Google中，大多数模糊效果在api＆lt; 16中不起作用。只是想知道我在代码中做错了什么。

Answer 1

当您尝试使用此代码时：

Bitmap blurredBitmap = blur（＆＃34;＆＃34; + roll [number]）;

此路径（ ＆＃34;＆＃34; + roll [number] ）与绝对路径不匹配，因为可运行时将可绘制资源添加到二进制文件，所以无法通过路径访问。尝试使用

<强> BitmapFactory.decodeResource（getResources（），RESOURCEID）;

 public Bitmap blur(int resourceId) {
        final Bitmap normalOne = BitmapFactory.decodeResource(getResources(),resourceId);
        final Bitmap resultBitmap = Bitmap.createBitmap(normalOne.getWidth(), normalOne.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(resultBitmap);
        mPaint.setAlpha(180);
        canvas.drawBitmap(normalOne, 0, 0, mPaint);
        int blurRadius = 12;
        for (int row = -blurRadius; row < blurRadius; row += 2) {
            for (int col = -blurRadius; col < blurRadius; col += 2) {
                if (col * col + row * row <= blurRadius * blurRadius) {
                    mPaint.setAlpha((blurRadius * blurRadius) / ((col * col + row * row) + 1) * 2);
                    canvas.drawBitmap(normalOne, row, col, mPaint);
                }
            }
        }
        normalOne.recycle();
        return resultBitmap;
    }

调用方法时出错

1 个答案: