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.chap5;
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();
}
}
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
package com.example.chap6;
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();
}
}
3.布局
<?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.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: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:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="45dp"
android:text="购物商城"
android:background="#53FF53"
android:textSize="18sp"
android:textColor="#FFFF37"
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"
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:padding="16dp">
<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="#FFFF37"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_price"
android:text="价格"
android:layout_below="@id/title"
android:layout_marginTop="10dp"
android:textSize="20sp"
android:textColor="#FFFF37"
/>
<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:layout_marginTop="10dp"
android:textColor="#FFFF37"
/>
</RelativeLayout>
</RelativeLayout>
package com.example.myapplication;
import androidx.appcompat.widget.ViewUtils;
import android.app.Activity;
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 MainActivity extends Activity {
private ListView mListView;
private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
private String[ ] prices = {"1000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};
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 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(MainActivity.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;
}
}
}package com.example.myapplication;
import androidx.appcompat.widget.ViewUtils;
import android.app.Activity;
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 MainActivity extends Activity {
private ListView mListView;
private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
private String[ ] prices = {"1000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};
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 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(MainActivity.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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<?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.教材p76页 图3—17购物商城界面
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<?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" tools:context=".MainActivity" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="45dp" android:text="购物商城" android:background="#53FF53" android:textSize="18sp" android:textColor="#FFFF37" android:gravity="center"/> <ListView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/lv" /></LinearLayout>复制代码复制代码<?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:padding="16dp"> <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="#FFFF37" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_price" android:text="价格" android:layout_below="@id/title" android:layout_marginTop="10dp" android:textSize="20sp" android:textColor="#FFFF37" /> <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:layout_marginTop="10dp" android:textColor="#FFFF37" /> </RelativeLayout></RelativeLayout>复制代码复制代码package com.example.myapplication;import androidx.appcompat.widget.ViewUtils;import android.app.Activity;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 MainActivity extends Activity { private ListView mListView; private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"}; private String[ ] prices = {"1000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}; 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 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(MainActivity.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; } }}package com.example.myapplication;import androidx.appcompat.widget.ViewUtils;import android.app.Activity;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 MainActivity extends Activity { private ListView mListView; private String[ ] titles = {"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"}; private String[ ] prices = {"1000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}; 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 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(MainActivity.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; } }} |
posted on 2021-09-25 20:15 chenyulin11 阅读(35) 评论(0) 收藏 举报
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