I am making code that resizes it to fit the screen size that its application provides. It gets the entire width and height (or the corresponding view of w and h) using the onSizeChanged () and onDraw () View methods.
It worked well in different code, but now it shows an error message when I tried to put the setLayoutParams () command. Could you help me sort this out? SetLayoutParams () actually doesn't work anywhere in the code. Below is the code for the main class.
public class ManipulateDesign extends Activity {private LinearLayout ll; private ScrollView sv; private TextView tv; / ** Called when the activity is first created. * / @Override public void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.main); ll = (LinearLayout) findViewById (R.id.ll); sv = (ScrollView) findViewById (R.id.sv); tv = new TextView (this); tv.setText ("You're in the first ScrollView \ n" + "- Living Universe \ n" + "Wish (upon a star) Hope to (be again) \ n" + "The one you find, when all is done and through! \ n "+" If all, made a wish to save, the star would it be in vain? \ n "+" So much it holds, too dear to part, many ways to see the light of answers! \ n "+" For all was once, just taken away, that one hope all disappeared so none can break nor brittle my heart \ n "+" no, never again, until the end "); sv.addView (tv); ChangeSizeView csv = new ChangeSizeView (getApplicationContext ()); ll.addView (csv); } class ChangeSizeView extends View {int newWidth; int newHeight; public ChangeSizeView (Context context) {super (context); } @Override protected void onSizeChanged (int w, int h, int oldw, int oldh) {newWidth = w; newHeight = h; super.onSizeChanged (w, h, oldw, oldh); } @Override protected void onDraw (Canvas canvas) {// THIS COMMAND MAKES AN ERROR (not just in this method but anywhere in the entire code) BUT WORKED WELL IN ANOTHER CODE sv.setLayoutParams (new LayoutParams (LayoutParams.WRAP_CONTENT, (newHeight - 100))); super.onDraw (canvas); }}} And this is my main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/ll" > <ScrollView android:id="@+id/sv" android:layout_height="wrap_content" android:layout_width="wrap_content"> </ScrollView> </LinearLayout>
This is the logcat logo displaying error messages.
04-11 06:39:52.148: ERROR/AndroidRuntime(2952): FATAL EXCEPTION: main 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.LinearLayout.measureVertical(LinearLayout.java:355) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.View.measure(View.java:8171) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.View.measure(View.java:8171) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.View.measure(View.java:8171) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.View.measure(View.java:8171) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.os.Handler.dispatchMessage(Handler.java:99) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.os.Looper.loop(Looper.java:123) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at android.app.ActivityThread.main(ActivityThread.java:4627) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at java.lang.reflect.Method.invokeNative(Native Method) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at java.lang.reflect.Method.invoke(Method.java:521) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 04-11 06:39:52.148: ERROR/AndroidRuntime(2952): at dalvik.system.NativeStart.main(Native Method)
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