5.6周作业
1.
package com.example.myapplication;
import androidx.appcompat.app.AlertDialog;import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Overridepublic void onBackPressed(){
AlertDialog dialog;
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setTitle("普通对话框")
.setIcon(R.mipmap.ic_launcher)
.setMessage("是 否退出应用:")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Overridepublic void onClick(DialogInterface dialog, int i) {
dialog.dismiss();
MainActivity.this.finish();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Overridepublic void onClick(DialogInterface dialog, int i) {
dialog.dismiss();
}
});
dialog=builder.create();
dialog.show();
}
}
2.
<?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:id="@+id/tv_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="单选对话框"
android:gravity="center"
android:layout_marginTop="20dp"
android:textSize="20sp"
android:textColor="#474141"
android:textStyle="bold"/>
<Button
android:id="@+id/bt_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请选择你的性 别"
android:layout_marginTop="20dp"
android:layout_gravity="center"
android:textSize="20sp"
android:textStyle="bold"
android:textColor="#474141"/>
</LinearLayout>package com.example.homework8;
import androidx.appcompat.app.AlertDialog;import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;import android.os.Build;import android.os.Bundle;import android.view.View;import android.widget.TextView;import android.widget.Toast;
import java.util.Locale;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private TextView textView;
final String [] sexs=new String[]{"男","女"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.bt_1).setOnClickListener(this);
textView=(TextView) findViewById(R.id.tv_1);
}
public void onClick(View view){
AlertDialog dialog;
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("请选择你的性别：");
builder.setIcon(R.mipmap.ic_launcher);
builder.setSingleChoiceItems(sexs, 1, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this,"您选择的是："+sexs[which],Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this,"您选择了"+sexs[which],Toast.LENGTH_LONG).show();
dialog.dismiss();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog=builder.create();
dialog.show();
}
3.
<?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.
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>
