Tag: getimagedata

Android从图库中获取图像到ImageView

我试图添加一个从Galery照片到一个ImageView但我得到这个错误： java.lang.RuntimeException：将结果ResultInfo {who = null，request = 1，result = -1，data = Intent {dat = content：// media / external / images / media / 1}}传递给activity {hotMetter。 pack / hotMetter.pack.GetPhoto}：java.lang.NullPointerException 这是我的代码： Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE); } Bitmap bitmap=null; public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == Activity.RESULT_OK) { […]

在鼠标hover上从canvas获取像素颜色

是否有可能获得鼠标下的RGB值像素？ 有没有一个完整的例子？ 以下是我到目前为止： <script> function draw() { var ctx = document.getElementById('canvas').getContext('2d'); var img = new Image(); img.src = 'Your URL'; img.onload = function(){ ctx.drawImage(img,0,0); }; canvas.onmousemove = function(e) { var mouseX, mouseY; if(e.offsetX) { mouseX = e.offsetX; mouseY = e.offsetY; } else if(e.layerX) { mouseX = e.layerX; mouseY = e.layerY; } var c = ctx.getImageData(mouseX, […]