第五丶六周作业
package com.example.test;
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);
}
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();
}
}
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;
import android.widget.Toast;
public class Demo4Activity extends AppCompatActivity implements View.OnClickListener {
private String[] sexArry={"男","女"};
private int sex=0;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo4);
findViewById(R.id.bt).setOnClickListener(this);
}
@Override
public void onClick(View view) {
AlertDialog dialog;
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setTitle("选择你的性别")
.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();
if (sex==0){
Toast.makeText(Demo4Activity.this, "你选择的性别是男", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(Demo4Activity.this, "你选择的性别是女", Toast.LENGTH_SHORT).show();
}
}
})
.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: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:background="#31B404"
android:layout_margin="2dp"
tools:context=".MyLayout">
<TextView
android:id="@+id/tv_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="1.TextView显示文本信息"
android:textSize="20sp"
android:textColor="#FF0000"
android:textStyle="bold"
android:gravity="center"
android:layout_marginTop="10dp"
/>
<Button
android:id="@+id/btn_1"
android:layout_width="350dp"
android:layout_height="wrap_content"
android:text="2.按钮"
android:textSize="20sp"
android:textColor="#FF0000"
android:textStyle="bold"
android:padding="5dp"
android:layout_centerHorizontal="true"
android:layout_below="@+id/tv_1"
/>
<EditText
android:id="@+id/et_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="3.编辑框：请输入信息"
android:textSize="20sp"
android:textColorHint="#FF0000"
android:layout_below="@id/btn_1"
android:layout_alignStart="@id/btn_1"
android:layout_margin="5dp"
/>
<RadioGroup
android:id="@+id/rg_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="@id/et_1"
android:layout_alignLeft="@id/et_1"
>
<RadioButton
android:id="@+id/rb_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4.男"
android:textColor="#FF0000"
android:textSize="20sp"
android:textStyle="bold"
/>
<RadioButton
android:id="@+id/rb_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:textColor="#FF0000"
android:textSize="20sp"
android:textStyle="bold"
/>
</RadioGroup>
<LinearLayout
android:id="@+id/ll_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_below="@id/rg_1"
android:layout_alignLeft="@id/rg_1">
<CheckBox
android:id="@+id/cb_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="电脑"
android:textSize="20sp"
/>
<CheckBox
android:id="@+id/cb_2"
android:layout
_width="wrap_content"
android:layout_height="wrap_content"
android:text="手机"
android:textSize="20sp"/>
</LinearLayout>
</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 Demo6Activity 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_demo6);
mListView=(ListView) findViewById(R.id.lv);
MyBaseAdapter mAdapter=new MyBaseAdapter();
mListView.setAdapter(mAdapter);
}
class MyBaseAdapter extends BaseAdapter{
public int getCount(){
return titles.length;
}
public Object getItem(int position){
return titles[position];
}
public long getItemId(int position){
return position;
}
public View getView(int position, View convertView, ViewGroup parent){
View view=View.inflate(Demo6Activity.this,R.layout.list_item,null);
TextView title=view.findViewById(R.id.title);
TextView price=view.findViewById(R.id.price);
ImageView iv=view.findViewById(R.id.iv);
title.setText(titles[position]);
price.setText(prices[position]);
iv.setBackgroundResource(icons[position]);
return view;
}
}
}
<?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"
android:padding="16dp">
<ImageView
android:id="@+id/iv"
android:layout_width="120dp"
android:layout_height="90dp"
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:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="桌子"
android:textSize="20sp"
android:textColor="#000000"/>
<TextView
android:id="@+id/tv_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="价格"
android:textSize="20sp"
android:textColor="#FF8F03"
android:layout_marginTop="10dp"
android:layout_below="@id/title"/>
<TextView
android:id="@+id/price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1000"
android:textSize="20sp"
android:textColor="#38EE74"
android:layout_below="@id/title"
android:layout_toRightOf="@id/tv_price"
android:layout_marginTop="10dp"/>
</RelativeLayout>
</RelativeLayout>
<?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=".Demo6Activity"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="45dp"
android:text="购物商城"
android:textSize="18sp"
android:textColor="#FFFFFF"
android:background="#FF8F03"
android:gravity="center"/>
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
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