![](/img/trans.png)
[英]Add margin or padding to RadioButton into a RadioGroup programmatically
[英]Add View Programmatically ignore padding
我正在为我的相对布局添加一个视图,周围有16dp填充
View blackView = new View(RestaurantActivity.this);
blackView.setMinimumHeight(height);
blackView.setMinimumWidth(width);
blackView.setBackgroundColor(Color.BLACK);
blackView.setAlpha(0.5f);
rl.addView(blackView);
而且此视图也具有该填充,但是我希望它填充全屏并忽略该填充,如何以编程方式完成此操作?
谢谢
编辑
我试过了
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)blackView.getLayoutParams();
float scale = getResources().getDisplayMetrics().density;
int dpAsPixels = (int) (-16*scale + 0.5f);
params.rightMargin = dpAsPixels;
params.leftMargin = dpAsPixels;
params.bottomMargin = dpAsPixels;
blackView.setLayoutParams(params);
但是得到了这个错误
E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.james.duss.ResturantActivity$1.onClick(ResturantActivity.java:156)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
工作代码:
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)blackView.getLayoutParams();
float scale = getResources().getDisplayMetrics().density;
int dpAsPixels = (int) (-16*scale + 0.5f);
params.rightMargin = dpAsPixels;
params.leftMargin = dpAsPixels;
params.bottomMargin = dpAsPixels;
blackView.setLayoutParams(params);
在您的xml布局文件中的RelativeLayout
: android:clipToPadding="false"
下面是一种更好,更清洁的解决方案,用于在dp中代替像素进行填充。
您必须将填充存储在资源文件(即dimens.xml
)中,因此您可以简单地调用:
int padding = getResources().getDimensionPixelOffset(R.dimen.padding);
它为您完成转换。 然后,可以将填充设置为所需的视图,例如:
mPicImageView.setPadding(padding, padding, padding, padding);
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