Android开发小知识点集锦

1.让EditText不自动获取焦点

android:focusable="true"
android:focusableInTouchMode="true"

2.Uri转绝对路径

private  String getFilePathByContentResolver(Context context, Uri uri) {
if (null == uri) {
return null;
}
Cursor c = context.getContentResolver().query(uri, null, null, null, null);
String filePath  = null;
if (null == c) {
throw new IllegalArgumentException(
"Query on " + uri + " returns null result.");
}
try {
if ((c.getCount() != 1) || !c.moveToFirst()) {
} else {
filePath = c.getString(
c.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA));
}
} finally {
c.close();
}
return filePath;
}

3.代码创建Drawable

private LayerDrawable createLayerDrawable() {
Drawable[] drawables = new Drawable[2];
drawables[0] = createShapeDrawable(0xffff0000, 2, 0xffffffff);
drawables[1] = createShapeDrawable(0xff00ff00, 2, 0xffffffff);
return new LayerDrawable(drawables);
}

private GradientDrawable createShapeDrawable(int color, int radius, int strokeColor) {
GradientDrawable drawable = new GradientDrawable();
drawable.setCornerRadius(DensityUtil.dp2px(radius));//设置4个角的弧度
drawable.setColor(color);// 设置颜色
drawable.setStroke(DensityUtil.dp2px(0.5f), strokeColor);
return drawable;
}