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\
package com.example.fivetwo; import android.os.Bundle; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public void onBackPressed() { AlertDialog dialog; AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setIcon(R.drawable.ic_launcher_background); builder.setTitle("普通对话框"); builder.setMessage("是否退出应用程序？"); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); MainActivity.this.finish();// 主窗口关闭 } }); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); dialog = builder.create(); dialog.show(); } }
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）
package com.example.fivethree; import android.net.wifi.WifiManager.MulticastLock; import android.os.Bundle; import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.DialogInterface.OnMultiChoiceClickListener; import android.view.Menu; import android.view.MenuItem.OnMenuItemClickListener; import android.view.View; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void onclick1(View view) { AlertDialog.Builder builder=new Builder(this); builder.setIcon(android.R.drawable.ic_dialog_info); builder.setTitle("请选择性别"); final String []items=new String[]{"男","女"}; builder.setSingleChoiceItems(items, -1, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "您选择的是:"+items[which], Toast.LENGTH_SHORT).show(); dialog.dismiss(); } }); builder.show(); } }
<?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:id="@+id/tv" android:gravity="center" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="单选对话框" /> <Button android:onClick="onclick1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="选择男女"/> </LinearLayout>
3.布局(详见:Android第五周上机word文档)
<?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"
android:background="#81F781">
<TextView
android:id="@+id/tv"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="1.textview显示文本信息"
android:textColor="#0101DF"
android:textSize="36dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="2.按钮"
android:textColor="#0101DF"
android:textSize="36dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="输入信息"
android:textColor="#0101DF"
android:textSize="36dp"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"
android:textColor="#0101DF"
android:textSize="36dp"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:textColor="#0101DF"
android:textSize="36dp"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="电脑"
android:textColor="#0101DF"
android:textSize="36dp"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="手机"
android:textColor="#0101DF"
android:textSize="36dp"/>
</LinearLayout>
4.教材p76页 图3—17购物商城界面
<?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/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="购物商城"
android:background="#FF4000"
android:textColor="#ffffff"
android:textSize="36dp"
/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
<?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="160dp"
android:layout_height="160dp"
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"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="价格:"
android:id="@+id/price"
android:layout_below="@+id/name"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"/>
</RelativeLayout>
package com.example.threeweektwo;
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 = {"香橙", "苹果", "蛋糕"};
private String[] prices = {"1800元", "10/kg", "300元"};
private int[] icons = {R.drawable.a1, R.drawable.a2, R.drawable.a3};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView) findViewById(R.id.invisible);
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.abcdefg, null);
TextView title = view.findViewById(R.id.name);
TextView price = view.findViewById(R.id.price);
ImageView iv = view.findViewById(R.id.shop_iv);
title.setText(titles[i]);
price.setText(prices[i]);
iv.setImageResource(icons[i]);
return view;
}
}
}
3.布局(详见:Android第五周上机word文档)
<?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"
android:background="#81F781">
<TextView
android:id="@+id/tv"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="1.textview显示文本信息"
android:textColor="#0101DF"
android:textSize="36dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="2.按钮"
android:textColor="#0101DF"
android:textSize="36dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="输入信息"
android:textColor="#0101DF"
android:textSize="36dp"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"
android:textColor="#0101DF"
android:textSize="36dp"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:textColor="#0101DF"
android:textSize="36dp"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="电脑"
android:textColor="#0101DF"
android:textSize="36dp"/>
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="手机"
android:textColor="#0101DF"
android:textSize="36dp"/>
</LinearLayout>
4.教材p76页 图3—17购物商城界面
<?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/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="购物商城"
android:background="#FF4000"
android:textColor="#ffffff"
android:textSize="36dp"
/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
<?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="160dp"
android:layout_height="160dp"
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"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="价格:"
android:id="@+id/price"
android:layout_below="@+id/name"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"/>
</RelativeLayout>
package com.example.threeweektwo;
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 = {"香橙", "苹果", "蛋糕"};
private String[] prices = {"1800元", "10/kg", "300元"};
private int[] icons = {R.drawable.a1, R.drawable.a2, R.drawable.a3};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView) findViewById(R.id.invisible);
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.abcdefg, null);
TextView title = view.findViewById(R.id.name);
TextView price = view.findViewById(R.id.price);
ImageView iv = view.findViewById(R.id.shop_iv);
title.setText(titles[i]);
price.setText(prices[i]);
iv.setImageResource(icons[i]);
return view;
}
}
}
3.布局(详见:Android第五周上机word文档)
<?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" android:background="#81F781"> <TextView android:id="@+id/tv" android:gravity="center" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="1.textview显示文本信息" android:textColor="#0101DF" android:textSize="36dp"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="2.按钮" android:textColor="#0101DF" android:textSize="36dp"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:text="输入信息" android:textColor="#0101DF" android:textSize="36dp"/> <RadioGroup android:layout_width="match_parent" android:layout_height="wrap_content" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="男" android:textColor="#0101DF" android:textSize="36dp"/> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="女" android:textColor="#0101DF" android:textSize="36dp"/> <CheckBox android:layout_width="match_parent" android:layout_height="wrap_content" android:text="电脑" android:textColor="#0101DF" android:textSize="36dp"/> <CheckBox android:layout_width="match_parent" android:layout_height="wrap_content" android:text="手机" android:textColor="#0101DF" android:textSize="36dp"/> </LinearLayout>
4.教材p76页 图3—17购物商城界面
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".Main5Activity"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="45dp"
android:text="购物商场"
android:textSize="18sp"
android:textColor="#741414"
android:background="#6C92B3"
android:gravity="center"/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/lv"/>
</LinearLayout>
<?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="120dp"
android:layout_height="90dp"
android:id="@+id/iv"
android:layout_centerVertical="true"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@+id/iv"
android:layout_centerVertical="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/title"
android:text="桌子"
android:textSize="20sp"
android:textColor="#551D1D"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_price"
android:textSize="20sp"
android:layout_marginTop="10dp"
android:layout_below="@+id/title"
android:textColor="#6B1919"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/price"
android:text="1000"
android:textSize="20sp"
android:layout_below="@+id/title"
android:layout_toRightOf="@+id/tv_price"
android:textColor="#8A435B"
android:layout_marginTop="10dp"/>
</RelativeLayout>
</RelativeLayout>
package com.example.myapplication;
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.ListView;
import android.widget.TextView;
public class Main5Activity 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.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_main5);
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 position){
return titles[position];
}
@Override
public long getItemId(int position){
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
View view=View.inflate(Main5Activity.this,R.layout.list_item,null);
TextView title=(TextView)view.findViewById(R.id.title);
TextView price=(TextView)view.findViewById(R.id.price);
ImageView iv=(ImageView)view.findViewById(R.id.iv);
title.setText(titles[position]);
price.setText(prices[position]);
iv.setBackgroundResource(icons[position]);
return view;
}
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