Android程序第3次作业

package com.example.myapplication;
import android.app.AlertDialog;

import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface;
import android.view.Menu;

public class Assignment03_02 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity03_02);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
//        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    @Override
    public void onBackPressed() {
    	AlertDialog dialog;
    	AlertDialog.Builder builder = new AlertDialog.Builder(this)
    		.setTitle("是否退出")
    		.setMessage("是否退出应用程序 :")
    		.setPositiveButton("确定", new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
					dialog.dismiss();
					Assignment03_02.this.finish();
				}
			})
			.setNegativeButton("取消", new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					dialog.dismiss();
				}
			});
    	dialog = builder.create();
    	dialog.show();
    }
    
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Assignment03_02" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

package com.example.myapplication;
import android.app.AlertDialog;

import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface;
import android.view.View;
import android.widget.Toast;
import android.widget.Button;
public class Assignment03_03 extends Activity {
	int gender = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity03_03);
		Button button0 = (Button)findViewById(R.id.button0);
		button0.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				AlertDialog dialog;
				AlertDialog.Builder builder = new AlertDialog.Builder(Assignment03_03.this)
						.setTitle("@string/chooseGender")
						.setSingleChoiceItems(new String[]{ "男", "女" }, 0, new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog, int which) {
								gender = which;
							}
						})
						.setPositiveButton("确定", new DialogInterface.OnClickListener() {
							@Override
							public void onClick(DialogInterface dialog, int which) {
								Toast.makeText(Assignment03_03.this, "你选择了" + (gender == 0 ? "男" : "女"), Toast.LENGTH_SHORT).show();
							}
						})
						.setNegativeButton("取消", new DialogInterface.OnClickListener() {
							@Override
							public void onClick(DialogInterface dialog, int which) {
								dialog.dismiss();
							}
						});
				dialog = builder.create();
				dialog.show();
			}
		});
	}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Assignment03_03" >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/chooseGender"
        android:layout_marginTop="25dp"
        android:layout_gravity="center"
        />
    
    <Button
        android:id="@+id/button0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/gender"
        android:layout_marginTop="25dp"
        android:layout_gravity="center"
        />

</LinearLayout>

package com.example.myapplication;

import android.os.Bundle;
import android.app.Activity;

public class Assignment03_04 extends Activity {
	int gender = 0;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity03_04);
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Assignment03_04" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/textView"
        android:layout_marginTop="25dp"
        android:textSize="25sp"
        android:gravity="center"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/button"
        android:layout_margin="25dp"
        />
    <EditText
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/editText"
        android:gravity="center"
        />
    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <RadioButton
            android:id="@+id/radioButton0"
            android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:textSize="25sp"
        	android:text="@string/male" 
            />
        <RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:textSize="25sp"
        	android:text="@string/female" 
            />
    </RadioGroup>
    <CheckBox
        android:id="@+id/checkBox0"
        android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:textSize="25sp"
        	android:text="@string/checkBox0"
        />
    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:textSize="25sp"
        	android:text="@string/checkBox1"
        />

</LinearLayout>

package com.example.myapplication;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class Assignment03_01 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元/kg", "300元", "350元", "10元/kg", "280元" };

    private int[] icons = { R.drawable.ic_launcher_foreground, R.drawable.ic_launcher_foreground,  R.drawable.ic_launcher_foreground, R.drawable.ic_launcher_foreground,  R.drawable.ic_launcher_foreground, R.drawable.ic_launcher_foreground };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity03_01);
        mListView = findViewById(R.id.listView);
        MyBaseAdapter mAdapter = new MyBaseAdapter();
        mListView.setAdapter(mAdapter);
    }
    class ViewHolder {
        TextView textViewTitle;
        TextView textViewContent;
        ImageView imageView;
    }
    class MyBaseAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return titles.length;
        }
        @Override
        public Object getItem(int position) {
            return titles[position];
        }
        @Override
        public long getItemId(int position) {
            return position;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if (convertView == null) {
                convertView = View.inflate(Assignment03_01.this, R.layout.list_item, null);
                holder = new ViewHolder();
                holder.textViewTitle = convertView.findViewById(R.id.textViewTitle);
                holder.textViewContent = convertView.findViewById(R.id.textViewContent);
                holder.imageView = convertView.findViewById(R.id.imageView);
            }
            else {
                holder = (ViewHolder)convertView.getTag();
            }
            holder.textViewTitle.setText(titles[position]);
            holder.textViewContent.setText(prices[position]);
            holder.imageView.setBackgroundResource(icons[position]);
            return convertView;
        }
    }
}

<?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="horizontal">
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ImageView>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:id="@+id/textViewTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="16sp"
            android:paddingTop="25dp">
        </TextView>
        <TextView
            android:id="@+id/textViewContent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="11sp">
        </TextView>
    </LinearLayout>

</LinearLayout>