当我尝试更改像素颜色时如何修复 Android 上的 IllegalStateException

Question

我试图使用以下代码将白色像素更改为透明像素。

private void transformPixelWhiteToTransparent() {
    MyLog.i(this, "removePixelBrancoDeImagem iniciado");

    String nomeArquivo = "RESMARFOC0001.jpg";
    File file = new File( "sdcard/Imagem/"+nomeArquivo);
    String path = file.getAbsolutePath();
    MyLog.i(this, "path: "+path);
    if(file.exists()) {  
        try{
            MyLog.i(this, "file exists");
            Bitmap bm = BitmapFactory.decodeFile(path);
            MyLog.i(this, "cheguei fim");

            for(int x = 0; x<bm.getWidth(); x++){
                for(int y = 0; y<bm.getHeight(); y++){
                    if(bm.getPixel(x, y) == Color.WHITE){
                        bm.setPixel(x, y, Color.TRANSPARENT);
                    }
                }
            }

            MyLog.i(this, "fim salvar arquivo");
        }catch (Exception e){
            MyLog.i(this, "erro: "+e);
        }

    }
}

但我在下一行中收到错误 IlegalStateException

"bm.setPixel(x, y, Color.TRANSPARENT);"

我该如何解决？

Answer 1

我找到了让我的代码工作的方法。

private void transformPixelWhiteToTransparent() {
    String nomeArquivo = "RESMARFOC0001.jpg"; // crie uma marca e depois troque o nome dela aqui
    File file = new File( "sdcard/Imagem/"+nomeArquivo);
    String path = file.getAbsolutePath();
    if(file.exists()) {  // se arquivo existe carrega para upload

        try{
            Bitmap bm1 = BitmapFactory.decodeFile(path);
            bm1.setHasAlpha(true);
            Bitmap bmMod = bm1.copy(bm1.getConfig(),true);

            for(int x = 0; x<bmMod.getWidth(); x++){
                for(int y = 0; y<bmMod.getHeight(); y++){
                    if(bmMod.getPixel(x, y) == Color.WHITE){
                        bmMod.setPixel(x, y, Color.TRANSPARENT); // Color.BLUE
                    }
                }
            }
            // more code to save the bitmap as PNG file

        }catch (Exception e){
            MyLog.i(this, "erro: "+e);
        }

    }
}

与我以前的代码唯一不同的是行

Bitmap bmMod = bm1.copy(bm1.getConfig(),true);

我需要创建原始位图的副本才能修改复制的位图。

当我尝试更改像素颜色时如何修复 Android 上的 IllegalStateException

How to fix IlegalStateException on Android when I try to change a pixel color

java

android

pixel