Background
I'm trying to put a view within a container view, so that the container will allow the view to have any height (and/or width,depending on your specification) , yet not pass a specific one.
The problem
There is no way to define "maxHeight" for any kind of view. You can only use exact size , use some tricks to take the spare size (layout_weight) or make the scrollView take as much space as it needs.
The only similar thing is for EditText , which you can use "maxLines" together with "setMovementMethod", as shown here .
What I've tried
I've tried to make the next viewGroup that contains the scrollView, but it didn't work as expected:
public class SizeLimitLayout extends FrameLayout {
private int mMaxHeightInPixels = -1;
private int mMaxWidthInPixels = -1;
public SizeLimitLayout(final Context context) {
super(context);
}
public SizeLimitLayout(final Context context, final AttributeSet attrs) {
super(context, attrs);
}
public SizeLimitLayout(final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
}
public void setMaxHeight(final int maxHeightInPixels) {
this.mMaxHeightInPixels = maxHeightInPixels;
}
public void setMaxWidth(final int maxWidthInPixels) {
this.mMaxWidthInPixels = maxWidthInPixels;
}
@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
// time to decide what is the size of this view
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth(), height = getMeasuredHeight();
if (mMaxWidthInPixels >= 0)
width = Math.min(mMaxWidthInPixels, width);
if (mMaxHeightInPixels >= 0)
height = Math.min(mMaxHeightInPixels, height);
setMeasuredDimension(width, height);
}
}
Here's a sample of how I tried to use what I made:
MainActivity.java
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final SizeLimitLayout sizeLimitLayout = (SizeLimitLayout) findViewById(R.id.sizeLimitLayout);
sizeLimitLayout.setMaxHeight((int) convertDpToPixels(this, 160));
final View btn = findViewById(R.id.button);
final ViewGroup container = (ViewGroup) findViewById(R.id.container);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) {
final ImageView iv = new ImageView(MainActivity.this);
iv.setImageResource(R.drawable.ic_launcher);
container.addView(iv);
}
});
}
public static float convertDpToPixels(final Context context, final float dp) {
final float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources()
.getDisplayMetrics());
return pixels;
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.viewsizelimittest.MainActivity"
tools:ignore="MergeRootFrame" >
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="click"
tools:ignore="HardcodedText" />
<com.example.viewsizelimittest.SizeLimitLayout
android:id="@+id/sizeLimitLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#33ff0000"
android:fillViewport="true" >
<LinearLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>
</com.example.viewsizelimittest.SizeLimitLayout>
</LinearLayout>
The question
The code almost works, but the container doesn't allow to scroll .
What can I do to fix it?
