LayoutParams使用示例

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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() {@Overridepublic void onClick(View v) {//1 获取到LayoutParamsLayoutParams layoutParams= (LayoutParams) mSecondButton.getLayoutParams();//2 修改LayoutParamslayoutParams.width=300;layoutParams.height=100;layoutParams.leftMargin=150;layoutParams.topMargin=300;//3 重新设置LayoutParamsmSecondButton.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>

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