Android第五六周作业
package com.example.myapplication; import android.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() { AlertDialog.Builder builder=new AlertDialog.Builder(this) .setTitle("普通对话框") .setMessage("是否退出至主菜单") // .setIcon(R.drawable.ic_launcher_background) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); MainActivity.this.finish(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); AlertDialog 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.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener { int x = 0; private String Arr[] = {"你选择男","你选择女"}; @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){ AlertDialog dialog; AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("性别"); builder.setSingleChoiceItems(new String[]{"男", "女"}, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int i) { x = i; // Toast.makeText(MainActivity.this,Arr[i], Toast.LENGTH_SHORT).show(); } }); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int i) { // final String items[]={"男","女"}; Toast.makeText(MainActivity.this,Arr[x], Toast.LENGTH_SHORT).show(); dialog.dismiss(); } }); builder.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"?> <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" android:background="#3857E0"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="1.TextView显示文本信息" android:layout_gravity="center" android:layout_marginTop="20dp" android:textColor="#FFFFFF"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:text="2.按钮" android:textColor="#000000" android:background="#ffffff"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="3.编辑框:请输入信息" android:textColorHint="#FFFFFF" android:layout_margin="20dp"/> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20dp" android:textColor="#FFFFFF" android:text="4.男" android:layout_marginLeft="10dp"/> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20dp" android:textColor="#FFFFFF" android:text="女" android:layout_marginLeft="10dp"/> </RadioGroup> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="电脑" android:textSize="20dp" android:textColor="#FFFFFF" android:layout_margin="10dp"/> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="手机" android:textSize="20dp" android:textColor="#FFEBEB" android:layout_marginLeft="10dp"/> </LinearLayout>
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.widget.TextView; import android.widget.ImageView; import android.widget.BaseAdapter; import android.view.View; import android.view.ViewGroup; //import android.os.Build; import android.os.Bundle; //import android.widget.ListAdapter; import android.widget.ListView; public class MainActivity 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}; // protected void onCreate(Build savedInstanceState){ // super.onCreate(savedInstanceState); // setContentView(R.layout.activity_main); // // } @Override 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; } } }
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:padding="16dp" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/iv" android:layout_width="120dp" android:layout_height="90dp" android:layout_centerVertical="true" ></ImageView> <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="match_parent" android:layout_height="match_parent" android:textSize="20sp" android:textColor="#000000" android:text="桌子"></TextView> <TextView android:id="@+id/prices" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:layout_marginTop="10dp" android:layout_below="@+id/title" android:text="价格:"></TextView> <TextView android:id="@+id/price" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="1800" android:textSize="20sp" android:layout_below="@+id/title" android:layout_toRightOf="@+id/prices" android:textColor="#BA000000" android:layout_marginTop="10dp"></TextView> </RelativeLayout> </RelativeLayout>
<?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"> <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="wrap_content" android:listSelector="#fefefefe" ></ListView> </LinearLayout>