我正在将一些视图动态添加到LinearLayout:
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(100, 100, 100, 100);
view.setLayoutParams(params);
parent.addView(view);
但是,没有应用边距。以下:
view.invalidate();
view.requestLayout();
parent.invalidate();
parent.requestLayout();
没有工作。但是,如果我强制重新创建活动(例如,关闭手机后再打开手机),则会应用边距。调用activity.recreate()也可以,但是太慢了。
如何强制布局重新计算边距?流程中可能有什么问题吗?我尝试在创建后将视图添加到根中,在应用属性之前和之后添加子级,但这对我不起作用。
UPD:我试图以编程方式重复该错误,并使用以下代码获取它:
LinearLayout base = new LinearLayout(context);
LayoutParams params1 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
base.setLayoutParams(params1);
base.setBackgroundColor(Color.CYAN);
root.addView(base);
LinearLayout another1 = new LinearLayout(context);
LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
another1.setLayoutParams(params2);
another1.setOrientation(LinearLayout.VERTICAL);
another1.setBackgroundColor(Color.BLUE);
base.addView(another1);
TextView tv1 = new TextView(context);
tv1.setText("SOME TEST TEXT 1");
tv1.setTextColor(Color.BLACK);
LayoutParams params4 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params4.setMargins(100, 100, 100, 100);
tv1.setLayoutParams(params4);
another1.addView(tv1);
TextView tv2 = new TextView(context);
tv2.setText("SOME TEST TEXT 2");
tv2.setTextColor(Color.BLACK);
LayoutParams params5 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params4.setMargins(100, 100, 100, 100);
tv2.setLayoutParams(params5);
another1.addView(tv2);
我希望应用边距,但不会。初始化这种视图的正确顺序是什么?
如果必须在onCreate()中执行此操作,请尝试以下代码。
final ViewTreeObserver observer = parent.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
LinearLayout.LayoutParams params = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(100, 100, 100, 100);
TextView view = new TextView(context);
view.setLayoutParams(params);
parent.addView(view);
observer.removeOnGlobalLayoutListener(this);
}
};