android - ImageButton 打开和关闭

Question

我如何打开和关闭 ImageButton 上的相机灯..这是我的代码

    public void liBtn(View v)
{
    int tur=0;
       if (tur==0)
       {
        Camera.Parameters p = camera.getParameters();
        p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
        camera.setParameters(p);
        camera.startPreview();
        int tur=1;
       }
        if (tur==1)
        {
              Camera.Parameters p = camera.getParameters();
              p.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
              camera.setParameters(p);
              camera.startPreview();
              int tur=0;
        }
}

有什么想法吗？

Answer 1

// Create a class member variable
private boolean isOn = false;

// And use it in your method
public void liBtn(View v) {
    Camera.Parameters p = camera.getParameters();

    if (!isOn) {
        p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
    } else {
        p.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
    }

    camera.setParameters(p);
    camera.startPreview();

    isOn = !isOn;
}