五六周

package itcast.cn;

        import android.app.AlertDialog;

        import android.content.DialogInterface;

        import android.os.Bundle;

        import android.app.Activity;

 

 

public class Main2Activity extends Activity {

 

 

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main2);

    }

 

 

 

    public void onBackPressed(){

        AlertDialog dialog;

        AlertDialog.Builder builder=new AlertDialog.Builder(this)

                .setTitle("普通对话框")

                .setIcon(R.drawable.ic_launcher_background)

                .setMessage("是否确定退出")

                .setPositiveButton("确定", new DialogInterface.OnClickListener() {

 

 

                    public void onClick(DialogInterface dialog, int which) {

                        dialog.dismiss();

                        Main2Activity.this.finish();}

 

                })

                .setNegativeButton("取消", new DialogInterface.OnClickListener() {

 

 

                    public void onClick(DialogInterface dialog, int which) {

                        dialog.dismiss();

                    }

                });

        dialog=builder.create();

        dialog.show();

    }

 

}

2.

 <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/bt_1"

        android:layout_width="wrap_content"

        android:layout_height="100dp"

        android:text="单选框"

        android:gravity="center"

        android:layout_marginTop="50dp"

        android:layout_gravity="center">

    </Button>

 

</LinearLayout>

package itcast.cn;

 

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;

 

 

public class Main2Activity extends Activity implements View.OnClickListener{

   private int i=1;

   private int i1[]={1,2};

 

 

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main2);

        findViewById(R.id.bt_1).setOnClickListener(this);

 

    }

 

    public void onClick(View v){

        AlertDialog dialog;

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setTitle("你的性别是？");

        builder.setSingleChoiceItems(new String[]{"女","男"},i,new DialogInterface.OnClickListener(){

            public void onClick(DialogInterface dialog,int which){

                i=which;

            }

        });

        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {

               if (i==1){

                   Toast.makeText(Main2Activity.this,"你选择了男",Toast.LENGTH_SHORT).show();

               }else{

                   Toast.makeText(Main2Activity.this,"你选择了女",Toast.LENGTH_SHORT).show();

               }

                dialog.dismiss();

            }

        });

        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

            @Override

            public void onClick(DialogInterface dialog, int which) {

                dialog.dismiss();

            }

        });

        dialog = builder.create();

        dialog.show();

 

    }

 

}

 

 

 

 

3.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    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="1.TextView显示的文本信息"

        android:textSize="25dp"

        android:layout_marginLeft="50dp"

        android:textColor="#8E8E8E"

        />

 

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="50dp"

        android:layout_marginTop="10dp"

        android:layout_marginRight="50dp"

        android:textSize="25dp"

        android:text="2.按钮"

        android:textColor="#8E8E8E    " />

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="3.编辑框:请输入信息"

        android:textSize="25dp"

        android:textColor="#8E8E8E    "

        android:layout_marginLeft="25dp"

        android:layout_marginTop="10dp"/>

    <RadioGroup

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginLeft="15dp"

        android:orientation="horizontal">

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="4.男"

            android:checked="true"

            android:textColor="#8E8E8E"

            android:textSize="25dp"></RadioButton>

        <RadioButton

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="女"

            android:textColor="#8E8E8E    "

            android:textSize="25dp"></RadioButton>

 

    </RadioGroup>

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="电脑"

        android:textSize="25dp"

        android:textColor="#8E8E8E    "

        android:checked="true"

        android:layout_marginLeft="20dp"

        />

    <CheckBox

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="手机"

        android:textSize="25dp"

        android:textColor="#8E8E8E    "

        android:checked="true"

        android:layout_marginLeft="20dp"

        />

 

</LinearLayout>

 

 4.

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#7AD610"

 

    tools:context=".MainActivity">

 

    <TextView

        android:id="@+id/tv1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="1.TextView显示文本信息"

        android:textColor="#F81D0D"

        android:textSize="25sp"

        android:textStyle="italic"

        android:gravity="center"

        android:layout_marginTop="30dp"

         />

 

 

    <Button

        android:id="@+id/bt1"

        android:layout_width="350dp"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_below="@+id/tv1"

        android:text="2.按钮"

        android:textColor="#F81D0D"

        android:textSize="25sp"

        android:layout_marginTop="10dp"

        android:padding="10dp"/>

 

 

    <EditText

        android:id="@+id/et1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="3.编辑框：请输入信息"

        android:textColorHint="#F81D0D"

        android:textSize="25sp"

        android:layout_below="@+id/bt1"

        android:layout_alignStart="@+id/bt1"

        android:layout_marginTop="5dp"

        android:padding="10dp"

        android:layout_alignLeft="@+id/bt1" />

 

    <RadioGroup

        android:id="@+id/rg1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/et1"

        android:layout_alignLeft="@+id/et1"

        android:orientation="horizontal"

        android:padding="10dp">

 

        <RadioButton

            android:id="@+id/rb1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="4.男"

            android:textColor="#F81D0D"

            android:textSize="25sp"

            />

 

        <RadioButton

            android:id="@+id/rb2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="女"

            android:textColor="#F81D0D"

            android:textSize="25sp"

            />

    </RadioGroup>

    <LinearLayout

        android:id="@+id/ll1"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="vertical"

        android:layout_alignLeft="@+id/rg1"

        android:layout_below="@id/rg1">

 

        <CheckBox

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="电脑"

            android:textSize="25sp"

            android:textColor="#F81D0D"

 

            />

 

        <CheckBox

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="手机"

            android:textSize="25sp"

            android:textColor="#F81D0D"

 

            />

 

    </LinearLayout>

 

 

</RelativeLayout>