测试一下在CSDN博客中插入代码

<LinearLayout        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="2" >        <EditText            android:id="@+id/editScreen"            android:layout_width="match_parent"            android:layout_height="match_parent" />    </LinearLayout>

<Button/>

xml

java

package com.t.layoutdemo1;import android.app.Activity;import android.os.Bundle;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}}