第五六周作业
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>