I created a custom view. In it, theres a line, a textview, another line. beneath the bottom line, i wanted to put a new horizontally oriented linearlayout. when i run it, this nested linearlayout doesnt seem to show up at all. Instead, i can see the test button right underneath the bottom line. what am i doing wrong?
public class MyView extends LinearLayout {
public MyView(Context context, Question question) {
super(context);
// this.setLayoutParams(params);
this.setOrientation(VERTICAL);
this.setBackgroundColor(Color.WHITE);
LinearLayout.LayoutParams lineParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 2);
View topLine = new View(context);
lineParams.setMargins(0, 15, 0, 0);
topLine.setBackgroundColor(Color.argb(255, 0, 159, 218));
topLine.setLayoutParams(lineParams);
this.addView(topLine);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
//Challenge Question
TextView questionText = new TextView(context);
questionText.setTextColor(Color.BLACK);
questionText.setTextSize(14);
questionText.setLayoutParams(params);
questionText.setGravity(Gravity.CENTER_HORIZONTAL);
questionText.setText(question.getQuestion());
this.addView(questionText);
View bottomLine = new View(context);
bottomLine.setBackgroundColor(Color.argb(255, 0, 159, 218));
bottomLine.setLayoutParams(lineParams);
this.addView(bottomLine);
LinearLayout innerLayout = new LinearLayout(context);
LinearLayout.LayoutParams innerLayoutParams = new LinearLayout.LayoutParams(300, LayoutParams.WRAP_CONTENT);
innerLayout.setLayoutParams(innerLayoutParams);
innerLayout.setBackgroundColor(Color.RED);
innerLayout.setOrientation(HORIZONTAL);
//TableLayout for the multiple choices
TableLayout tableLayout = new TableLayout(context);
LayoutParams tableLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
// tableLayoutParams.weight = .8f;
tableLayout.setBackgroundColor(Color.RED);
tableLayout.setLayoutParams(tableLa开发者_如何学CyoutParams);
innerLayout.addView(tableLayout);
this.addView(innerLayout);
Button button = new Button(context);
button.setLayoutParams(params);
button.setText("testing 123");
this.addView(button);
}
Note that I pasted the code without all the stuff that I added to the tablelayout. I probably should have pasted that too. But it didn't work when I did that either. but either way, if i set the nested linearlayout to 300 width and set a background color of red to it, i should at least see it, no?
Think about what the height of the inner layout should be. Right now it is wrap_content
and contains a TableLayout
(with no rows) with its height also set to wrap_content
. There doesn't seem to be anything in that inner layout giving it a height dimension, so that may be why it is not being displayed.
Trying the following will make your layout visible:
LinearLayout.LayoutParams innerLayoutParams = new LinearLayout.LayoutParams(300, 300);
More usefully, you can try adding something with a real width/height to the TableLayout
.
Also consider writing your layout in XML to better separate your application logic and the presentation.
精彩评论