Android RelativeLayout布局
例题2-8
activity_main.xml代码
1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout android:layout_width="fill_parent" 3 android:layout_height="fill_parent" 4 xmlns:android="http://schemas.android.com/apk/res/android"> 5 <TextView 6 android:id="@+id/label" 7 android:layout_width="match_parent" 8 android:layout_height="wrap_content" 9 android:text="输入一串字符" 10 android:gravity="center"/> 11 <EditText 12 android:id="@+id/txt" 13 android:layout_width="match_parent" 14 android:layout_height="wrap_content" 15 android:layout_below="@id/label" 16 android:hint="在这里输入123"/> 17 <Button 18 android:id="@+id/but1" 19 android:layout_width="wrap_content" 20 android:layout_height="wrap_content" 21 android:text="重置" 22 android:layout_below="@id/txt"/> 23 <Button 24 android:id="@+id/but2" 25 android:layout_width="wrap_content" 26 android:layout_height="wrap_content" 27 android:text="确认" 28 android:layout_toRightOf="@id/but1" 29 android:layout_marginLeft="150dp" 30 android:layout_below="@+id/txt"/> 31 <TextView 32 android:id="@+id/labe2" 33 android:layout_width="match_parent" 34 android:layout_height="wrap_content" 35 android:layout_below="@id/but2" 36 android:gravity="center"/> 37 </RelativeLayout>
Mainactivity代码
1 package com.example.hello; 2 3 import androidx.appcompat.app.AppCompatActivity; 4 5 import android.graphics.Color; 6 import android.os.Bundle; 7 import android.view.View; 8 import android.widget.Button; 9 import android.widget.TextView; 10 11 public class MainActivity extends AppCompatActivity { 12 private TextView txt; 13 private TextView txt2; 14 private Button button1; 15 private Button button2; 16 @Override 17 protected void onCreate(Bundle savedInstanceState) { 18 super.onCreate(savedInstanceState); 19 setContentView(R.layout.activity_main); 20 txt = (TextView)findViewById(R.id.labe2); 21 txt2 = (TextView)findViewById(R.id.txt); 22 button1 = (Button)findViewById(R.id.but1); 23 button2 = (Button)findViewById(R.id.but2); 24 button1.setOnClickListener(new bClick()); 25 button2.setOnClickListener(new mClick()); 26 } 27 28 class mClick implements View.OnClickListener { 29 public void onClick(View view){ 30 txt.setText("输入成功"); 31 } 32 } 33 class bClick implements View.OnClickListener { 34 public void onClick(View view){ 35 txt2.setText(""); 36 } 37 } 38 }
