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I'm having one empty Linear Layout in xml. And I'm adding some text view to it dynamically.
once these textviews exceeds 5 then i'm creating one more linear layout inside it and adding text views to newly created Layout. And finally adding this new layout to main layout.
I'm able to add, i.e in emulator it occupy that space but, will not display the info in the textviews.
my xml is as follows:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/dyn_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dip" >
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/dyn_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add TextViews" />
</LinearLayout>
and my java file is as follows:
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
public class AddTextViewsDynamically extends Activity implements
OnClickListener {
Button button;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_textview_dynamically);
button = (Button) findViewById(R.id.dyn_button1);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dyn_button1:
LinearLayout layout = (LinearLayout) findViewById(R.id.dyn_layout);
LinearLayout layout2 = null;
LinearLayout layout3 = null;
for (int i = 0; i < 10; i++) {
if (i > 4) {
if (i == 5) {
layout2 = new LinearLayout(this);
layout2.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout2.setOrientation(LinearLayout.VERTICAL);
layout2.setPadding(10, 60, 10, 10);
layout3 = new LinearLayout(this);
layout3.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout3.setOrientation(LinearLayout.HORIZONTAL);
layout3.setPadding(10, 10, 10, 10);
}
System.out.println("**** Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout3.addView(text);
if (i == 9) {
System.out
.println("Added second linear layout to first");
layout2.setVisibility(View.VISIBLE);
layout2.addView(layout3);
layout.addView(layout2);
}
} else {
System.out.println("###### Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout.addView(text);
}
}
}
}
}
Where am I going wrong?
597
We can use LinearLayout inside RelativeLayout. We can also use RelativeLayout as a Child of LinearLayout.
To efficiently reuse complete layouts, you can use the <include> and <merge> tags to embed another layout inside the current layout. Reusing layouts is particularly powerful as it allows you to create reusable complex layouts.
Most of what can be done in LinearLayout and RelativeLayout can now be done with a new layout system called ConstraintLayout. It's important to note the class hierarchy of these View Layouts. Each of them subclass ViewGroup , which itself subclasses View .
To create a linear layout in which each child uses the same amount of space on the screen, set the android:layout_height of each view to "0dp" (for a vertical layout) or the android:layout_width of each view to "0dp" (for a horizontal layout). Then set the android:layout_weight of each view to "1" .
Your primary LinearLayout is set to Horizontal so the first 5 text view and the layout2 are shown on the same line. Adding Layout3 to Layout2 makes the Layout3 to be shown from the right of the last text view from primary Linear Layout. On a 10 inch tablet i see only the first 2 elements of your LinearLayout. Perhaps on a smaller screen you don't see them. Try using
text.setLayoutParams(new LayoutParams(50, LayoutParams.WRAP_CONTENT));
instead of
text.setLayoutParams(new LayoutParams(155, LaoutParams.WRAP_CONTENT));
and you should see all your text views.
EDIT : In your case this should do the trick; xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/dyn_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dip" >
</LinearLayout>
<LinearLayout
android:id="@+id/dyn_layout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone"
android:padding="10dip" >
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/dyn_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add TextViews" />
</LinearLayout>
and code :
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dyn_button1:
LinearLayout layout = (LinearLayout) findViewById(R.id.dyn_layout);
LinearLayout layout2 = (LinearLayout) findViewById(R.id.dyn_layout2);
LinearLayout layout3 = null;
for (int i = 0; i < 10; i++) {
if (i > 4) {
if (i == 5) {
layout2.setPadding(10, 60, 10, 10);
layout3 = new LinearLayout(this);
layout3.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout3.setOrientation(LinearLayout.HORIZONTAL);
layout3.setPadding(10, 10, 10, 10);
}
System.out.println("**** Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout3.addView(text);
if (i == 9) {
System.out
.println("Added second linear layout to first");
layout2.setVisibility(View.VISIBLE);
layout2.addView(layout3);
}
} else {
System.out.println("###### Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout.addView(text);
}
}
}
}
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