java-Android-简单的登录,radiobutton,checkbox,滚动屏幕，网格视图，列表视图
简单的登录
Mainactivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button btn1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //mainactivty的布局方式采用的是activity_main.xml btn1= (Button)findViewById(R.id.btn1); //获取按钮的对象 btn1.setOnClickListener(new View.OnClickListener() { //对按键设置按键监听 @Override public void onClick(View v) { Intent intent=new Intent(MainActivity.this,btn1Activity.class); startActivity(intent); //intent实际上是跳转到另外的activity的操作 //当按钮按下的时候，将从mainactivity跳转至btn1activity } }); } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/btn1" android:text="登陆操作" android:layout_width="200dp" android:layout_height="50dp" android:background="#FFAABBCC"> </Button> </LinearLayout>
btn1activity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class btn1Activity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { Button btn; Button loginbtn; final EditText edittext; final EditText edittext2; super.onCreate(savedInstanceState); setContentView(R.layout.activity_btn1); //此activity采用的布局方式是activity_btn1 btn=findViewById(R.id.btn); //找到返回按钮 loginbtn=findViewById(R.id.loginbtn); //找到登录按钮 edittext=findViewById(R.id.edittext); //找到第一个用户名的输入框 edittext2=findViewById(R.id.edittext2); //找到第二个密码的输入框 btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //设置返回按钮的跳转界面，返回按钮将会跳转回之前的mainactivity Intent intent=new Intent(btn1Activity.this,MainActivity.class); startActivity(intent); } }); loginbtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //设置登录按钮的按键监听 String username=edittext.getText().toString(); //获取用户名 String password=edittext2.getText().toString(); //获取密码 System.out.println("用户名"+username); System.out.println("密码"+password); if (username.equals("zqh") && password.equals("zqh")){ //如果用户名和密码输入的都是zqh Toast.makeText(btn1Activity.this, "登陆成功", Toast.LENGTH_SHORT).show(); //toast是屏幕底端弹出显示框显示 } } }); } }
activity_btn1.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:layout_marginTop="20dp" android:id="@+id/btn" android:layout_width="100dp" android:layout_height="50dp" android:background="#FFAADD" android:text="返回"> </Button> <EditText android:layout_marginTop="20dp" android:id="@+id/edittext" android:layout_width="match_parent" android:layout_height="50dp" android:textSize="16dp" android:hint="用户名"> </EditText> <EditText android:layout_marginTop="20dp" android:id="@+id/edittext2" android:layout_width="match_parent" android:layout_height="50dp" android:textSize="16dp" android:hint="密码" android:inputType="textPassword"> </EditText> <Button android:id="@+id/loginbtn" android:layout_marginTop="30dp" android:layout_width="match_parent" android:layout_height="70dp" android:background="#FF55DD" android:text="登录"> </Button> </LinearLayout>
Androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.myapplication"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <!--创建新的activity之后记得来这里进行声明--> <activity android:name=".btn1Activity"></activity> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Radiobutton
Mainactivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button btn1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //mainactivty的布局方式采用的是activity_main.xml } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <!--radiogroup是按钮的组，在同一个组里面的radiobutton只能被选中一个 checked是初始的选中状态--> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <RadioButton android:id="@+id/man" android:layout_width="100dp" android:layout_height="50dp" android:checked="true" android:text="男"> </RadioButton> <RadioButton android:id="@+id/female" android:layout_width="100dp" android:layout_height="50dp" android:text="女"> </RadioButton> </RadioGroup> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <RadioButton android:id="@+id/man2" android:layout_width="100dp" android:layout_height="50dp" android:background="@drawable/radio_select" android:checked="true" android:text="男"> </RadioButton> <RadioButton android:id="@+id/female2" android:layout_width="100dp" android:layout_height="50dp" android:background="@drawable/radio_select" android:text="女"> </RadioButton> </RadioGroup> </LinearLayout>
radio_select.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_checked="true"> <shape> <solid android:color="#FFAACC"/> <corners android:radius="5dp"/> </shape> </item> <item android:state_checked="false"> <shape> <solid android:color="#FFBB33"/> <corners android:radius="5dp"/> </shape> </item> </selector>
Checkbox复选框
mainactivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private CheckBox checkBox1; private CheckBox checkBox2; private CheckBox checkBox3; private Button checkbutton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //mainactivty的布局方式采用的是activity_main.xml checkBox1=findViewById(R.id.checkb1); checkBox2=findViewById(R.id.checkb2); checkBox3=findViewById(R.id.checkb3); checkbutton=findViewById(R.id.checkbutton); checkbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this," java "+checkBox1.isChecked() +" python "+checkBox2.isChecked()+ " c++ "+checkBox3.isChecked(),Toast.LENGTH_SHORT).show(); } }); } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="你会哪些的开发方式" android:textSize="40dp"/> <CheckBox android:id="@+id/checkb1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Java" android:textSize="25dp" /> <CheckBox android:id="@+id/checkb2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Python" android:textSize="25dp" /> <CheckBox android:id="@+id/checkb3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="C++" android:textSize="25dp" /> <Button android:id="@+id/checkbutton" android:layout_width="200dp" android:layout_height="50dp" android:text="检查选中的内容"/> </LinearLayout>
滚动屏幕scrollview
<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <!--注意scrollview和horizentalscrollview里面都是只能有一个元素，所以在外面套了一个 linearlayout--> <LinearLayout android:layout_width="match_parent" android:layout_height="300dp" android:orientation="vertical"> <View android:background="#FF11" android:layout_width="match_parent" android:layout_height="300dp"/> <View android:background="#FF11AA" android:layout_width="match_parent" android:layout_height="300dp"/> <View android:background="#FF1111AA" android:layout_width="match_parent" android:layout_height="300dp"/> <View android:background="#FF11DDAA" android:layout_width="match_parent" android:layout_height="300dp"/> </LinearLayout> </ScrollView>
网格视图
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <GridView android:id="@+id/gridview" android:layout_width="match_parent" android:layout_height="match_parent" android:numColumns="3"> </GridView> </RelativeLayout>
ceil.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/img" android:layout_width="100dp" android:layout_height="75dp"/> </LinearLayout>
Mainactivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.GridView; import android.widget.SimpleAdapter; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class MainActivity extends AppCompatActivity { private CheckBox checkBox1; private CheckBox checkBox2; private CheckBox checkBox3; private Button checkbutton; int[] paint_path = new int[]{ R.drawable.img0,R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4 }; //paint_path里面装的是图片的id号 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //mainactivty的布局方式采用的是activity_main.xml GridView gridView = (GridView) this.findViewById(R.id.gridview); List<Map<String,Object>> listitem = new ArrayList<Map<String,Object>>(); for (int i = 0;i<paint_path.length;i++){ Map<String,Object> map = new HashMap<String,Object>(); map.put("image",paint_path[i]); //map相当于字典，key是image，value是图片的id号 listitem.add(map); } System.out.println("sssss"+listitem.size()); //simpleadapter的5项(第一项是上下文this,第二项是List<Map<String,Object>>列表, // 第三项是子网格的布局文件，第四项是一个字符串数组，用来存放List<Map<String,Object>>里面 //的那些key,在这里面就是"image",第五项是一个整形数组，里面放的是子网格的imageview的id号 SimpleAdapter simpleAdapter = new SimpleAdapter(this,listitem, R.layout.ceil,new String[]{"image"},new int[]{R.id.img}); gridView.setAdapter(simpleAdapter); } }
列表视图
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <Spinner android:id="@+id/spinner" android:entries="@array/ctype" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </RelativeLayout>
array.xml(res的values文件下)
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="ctype"> <item>ab</item> <item>杀马特</item> <item>狗哥</item> </string-array> </resources>
Mainactivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.GridView; import android.widget.SimpleAdapter; import android.widget.Spinner; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class MainActivity extends AppCompatActivity { private CheckBox checkBox1; private CheckBox checkBox2; private CheckBox checkBox3; private Button checkbutton; String[] ctype = new String[]{"dsada","nabu","来来"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //mainactivty的布局方式采用的是activity_main.xml Spinner spinner = findViewById(R.id.spinner); //不仅可以在values里面对其下拉选项进行指定，也可以在arryadapter里面进行指定。 //第一个是上下文this，第二个是安卓自带的spinner显示布局，第三个是修改的字符串数组 ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,ctype); arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(arrayAdapter); } }
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