Android第五、六周作业

1.返回键实现对话框弹出是否退出应用程序

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package com.example.android_924;

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")
                .setIcon(R.mipmap.ic_launcher)
                .setMessage("是否确定退出应用:")
                .setPositiveButton("是", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        MainActivity.this.finish();
                    }
                })
                .setNegativeButton("否", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        dialog=builder.create();
        dialog.show();

    }
}
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2.实现以下场景：从一个activity中点击一个按钮后，弹出一个单选按钮对话框，上面有“男”“女”两个选项，选定后，TOAST弹出 你选择了男，或你选择了女（参考书上改字体）

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package com.example.android_924_02;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    private int num0=0;
    private int num1[]={0,1};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.bt).setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        AlertDialog.Builder builder=new AlertDialog.Builder(this)
                .setTitle("性别")
                .setSingleChoiceItems(new String[]{"男","女"}, -1, new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        num0=which;
                    }
                })
                .setPositiveButton("是",new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        if(num0==0){
                            Toast.makeText(MainActivity.this, "您选择的是男", Toast.LENGTH_LONG).show();
                        }else{
                            Toast.makeText(MainActivity.this, "您选择的是女", Toast.LENGTH_SHORT).show();
                        }
                        dialog.dismiss();
                    }
                })
                .setNegativeButton("否", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        dialog.dismiss();
                    }
                });
        AlertDialog dialog=builder.create();
        dialog.show();
    }
}
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3.布局(详见:Android第五周上机word文档)

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<?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"
    tools:context=".MainActivity"
    android:background="#67AC96">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:text="1.TextView显示文本信息"
        android:textStyle="italic"
        android:textColor="#FF0000"
        android:layout_marginTop="10dp"
        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:background="@drawable/glg"
        android:textColor="#FF0000"
        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="#FF0000"
        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/rb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4.男"
        android:textSize="30sp"
        android:layout_marginTop="180dp"
        android:textColor="#FF0000"
        android:layout_marginLeft="35dp"/>
    <RadioButton
        android:id="@+id/rb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="女"
        android:layout_toRightOf="@id/rb1"
        android:textSize="30sp"
        android:layout_marginTop="180dp"
        android:textColor="#FF0000"
        android:layout_marginLeft="35dp"/>
    <CheckBox
        android:id="@+id/cb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="电脑"
        android:textColor="#FF0000"
        android:textSize="30sp"
        android:layout_marginTop="230dp"
        android:layout_marginLeft="35dp"/>
    <CheckBox
        android:id="@+id/cb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="手机"
        android:textColor="#FF0000"
        android:textSize="30sp"
        android:layout_below="@id/cb1"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="35dp"/>


</RelativeLayout>
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4.教材p76页 图3—17购物商城界面

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<?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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/gouqu"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#4CE713"
        android:text="购物商城"
        android:textSize="35sp"
        android:gravity="center"
        />
    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lv"
        android:layout_below="@id/gouqu"/>
</RelativeLayout>
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:id="@+id/shop_iv"
        />
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_toRightOf="@id/shop_iv"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/name_shop"
            android:layout_marginTop="50dp"
            android:layout_marginLeft="15dp"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="价格:"
            android:id="@+id/pr"
            android:layout_below="@id/name_shop"
            android:layout_marginTop="50dp"
            android:layout_marginLeft="15dp"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/price_shop"
            android:layout_toRightOf="@id/pr"
            android:layout_below="@id/name_shop"
            android:layout_marginTop="50dp"
            android:layout_marginLeft="15dp"/>
    </RelativeLayout>
</RelativeLayout>
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package com.example.myapplication924_04;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private ListView mListView;
    private String[] titles = {"桌子", "苹果", "蛋糕", "线衣", "猕猴桃", "围巾"};
    private String[] prices = {"1800元", "10/kg", "300元", "350元", "10/kg", "280元"};
    private int[] icons = {R.drawable.table, R.drawable.apple, R.drawable.cake, R.drawable.wireclothes, R.drawable.kiwifruit, R.drawable.scarf};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.lv);
        MyBaseAdapter mAdapter = new MyBaseAdapter();
        mListView.setAdapter( mAdapter);
    }
    class MyBaseAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return titles.length;
        }

        @Override
        public Object getItem(int i) {
            return titles[i];
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            view = View.inflate(MainActivity.this, R.layout.item, null);
            TextView title = view.findViewById(R.id.name_shop);
            TextView price = view.findViewById(R.id.price_shop);
            ImageView iv = view.findViewById(R.id.shop_iv);
            title.setText(titles[i]);
            price.setText(prices[i]);
            iv.setImageResource(icons[i]);
            return view;
        }
    }

}
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posted @   刘广  阅读(43)  评论(0)  编辑  收藏  举报
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