第五，六次作业

package com.example.myapplication;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
    }
 
    @Override
    public void onBackPressed() {
        final AlertDialog dialog;
        AlertDialog.Builder builder=new AlertDialog.Builder(this)
                .setTitle("普通对话框")//设置对话框标题
                .setIcon(R.mipmap.ic_launcher)//设置设置标题图标
                .setMessage("是否确定退出应用：")//设置对话框的提示信息
                //添加"确定"按钮
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int i) {
                        dialog.dismiss();//关闭对话框
                        MainActivity.this.finish();//关闭MainActivity
                    }
                })
                //t添加"取消"按钮
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int i) {
                        dialog.dismiss();
                    }
                });
        dialog=builder.create();
        dialog.show();
 
    }
}

 

 

<?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"
    tools:context=".Main3Activity">
    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="您的性别是："
        android:gravity="center"
        android:textSize="20sp"
        android:layout_marginTop="10dp"
        android:textColor="#FFFDB371"/>
    <Button
        android:id="@+id/bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择性别"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"/>
 
</LinearLayout>

package com.example.myapplication;
 
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
 
public class Main2Activity extends AppCompatActivity implements View.OnClickListener {
    private TextView textView;
    private String[] sexArry= {"男", "女"};
    int sex = 1;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        findViewById(R.id.bt).setOnClickListener(this);
        textView = (TextView) findViewById(R.id.tv);
    }
 
    @Override
    public void onClick(View v) {
        AlertDialog dialog;
        AlertDialog.Builder builder=new AlertDialog.Builder(this)
                .setTitle("选择性别")
                .setIcon(R.mipmap.ic_launcher)
                .setSingleChoiceItems(new String[]{"男", "女"}, sex, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int i) {
                        sex=i;
                    }
                })
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int i) {
                        dialog.dismiss();//关闭对话框
                        if (sex==1){
                            textView.setText("您的性别是：女");
                        }else{
                            textView.setText("您的性别是：男");
                        }
                    }
                })
                //t添加"取消"按钮
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int i) {
                        dialog.dismiss();
                    }
                });
        dialog=builder.create();
        dialog.show();
    }
}

 

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:background="#00BCD4">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:text="1.TextView显示文本信息"
        android:textStyle="italic"
        android:textColor="#FFFFFF"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="50dp"
        android:textSize="30sp"/>
 
    <Button
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="60dp"
        android:layout_marginRight="20dp"
        android:text="2.按钮"
        android:textColor="#FFFFFF"
        android:textSize="30sp" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:text="3.编辑框:请输入信息"
        android:textSize="30sp"
        android:layout_marginTop="120dp"
        android:textColor="#FFFFFF"
        android:layout_marginLeft="35dp"/>
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:orientation="horizontal"/>
    <RadioButton
        android:id="@+id/rb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4.男"
        android:textSize="30sp"
        android:layout_marginTop="180dp"
        android:textColor="#FFFFFF"
        android:layout_marginLeft="35dp"/>
    <RadioButton
        android:id="@+id/rb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="女"
        android:layout_toRightOf="@id/rb_1"
        android:textSize="30sp"
        android:layout_marginTop="180dp"
        android:textColor="#FFFFFF"
        android:layout_marginLeft="35dp"/>
    <CheckBox
        android:id="@+id/cb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="电脑"
        android:textColor="#FFFFFF"
        android:textSize="30sp"
        android:layout_marginTop="230dp"
        android:layout_marginLeft="35dp"/>
    <CheckBox
        android:id="@+id/cb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="手机"
        android:textColor="#FFFFFF"
        android:textSize="30sp"
        android:layout_below="@id/cb_1"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="35dp"/>
 
  </RelativeLayout>