MainActivity如下:
package cc.c;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout.LayoutParams;
/**
* Demo描述:
* LayoutParams使用示例
* 利用getLayoutParams()和setLayoutParams()获取和设置控件的布局
*/
public class MainActivity extends Activity {
private Button mFirstButton;
private Button mSecondButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
mFirstButton=(Button) findViewById(R.id.firstButton);
mSecondButton=(Button) findViewById(R.id.secondButton);
mFirstButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//1 获取到LayoutParams
LayoutParams layoutParams= (LayoutParams) mSecondButton.getLayoutParams();
//2 修改LayoutParams
layoutParams.width=300;
layoutParams.height=100;
layoutParams.leftMargin=150;
layoutParams.topMargin=300;
//3 重新设置LayoutParams
mSecondButton.setLayoutParams(layoutParams);
}
});
}
}
main.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/firstButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="firstButton" />
<Button
android:id="@+id/secondButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dip"
android:text="secondButton" />
</LinearLayout>
