I'm developing a application where the user is supposed to be able to alter the apperence of a button by pressing other buttons. I use four buttons to set height as wrap content, height as fill parent, width as wrap content and width as fill parent.
I googled a bit and found a solution using LayoutParams although that code didn't specify if height of width was alterd. I also got errors saying my IDE couldn't recognise "LayoutParams". What is the best way to do this?
What you need to look for - is View.ViewGroup.LayoutParams. Every LayoutParams has constant value for MATCH_PARENT and WRAP_CONTENT attributes. I have prepared simple code sample you can play with:
Activity:
package com.example.stack2;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
Button test;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b = (Button)findViewById(R.id.button1);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button2);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button3);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button4);
b.setOnClickListener(this);
test = (Button)findViewById(R.id.test);
}
public void onClick(View v)
{
LayoutParams lp = test.getLayoutParams();
if(v.getId() == R.id.button1)
{
lp.height = LayoutParams.WRAP_CONTENT;
}else if(v.getId() == R.id.button2){
lp.width = LayoutParams.WRAP_CONTENT;
}else if(v.getId() == R.id.button3){
lp.height = LayoutParams.MATCH_PARENT;
}else if(v.getId() == R.id.button4){
lp.width = LayoutParams.MATCH_PARENT;
}
test.setLayoutParams(lp);
}
}
Layout 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" >
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_wc" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="w_wc" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_fp" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_fp" />
</LinearLayout>
<Button
android:id="@+id/test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="test" />
</LinearLayout>
By using the below code you can easily alter the height and width dynamically.
btn = new Button(Activity.this);
btn.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
btn.setText("\t\t" + lbl + "\t\t\t ");
btn.setBackgroundResource(R.drawable.blue_button);
btn.setwidth(100);
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