安卓第三次作业
1.
package com.example.myapplication;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.text.AlteredCharSequence;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
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) {
// TODO Auto-generated method stub
dialog.dismiss();
MainActivity.this.finish();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
AlertDialog dialog=builder.create();
dialog.show();
}
}
2.
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(); } }
<?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"> <Button android:id="@+id/bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="请选择你的性别" android:textSize="25dp" android:layout_marginTop="32dp" android:layout_gravity="center"/> </LinearLayout>
3.
<?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" tools:context=".MainActivity" android:background="#8BEC1B"> <TextView android:layout_width="wrap_content" android:layout_height="35dp" android:text="1.TextView显示文本信息" android:textStyle="italic" android:textColor="#E71D1D" android:layout_marginTop="20dp" android:layout_marginLeft="50dp" android:textSize="30sp"/> <Button android:layout_width="match_parent" android:layout_height="60dp" android:layout_marginLeft="20dp" android:layout_marginTop="60dp" android:layout_marginRight="20dp" android:text="2.按钮" android:textColor="#E71D1D" android:textSize="30sp" /> <EditText android:layout_width="match_parent" android:layout_height="60dp" android:text="3.编辑框:请输入信息" android:textSize="30sp" android:layout_marginTop="120dp" android:textColor="#E71D1D" android:layout_marginLeft="35dp"/> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:layout_marginRight="20dp" android:orientation="horizontal"/> <RadioButton android:id="@+id/rb_1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="4.男" android:textSize="30sp" android:layout_marginTop="180dp" android:textColor="#E71D1D" android:layout_marginLeft="35dp"/> <RadioButton android:id="@+id/rb_2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="女" android:layout_toRightOf="@id/rb_1" android:textSize="30sp" android:layout_marginTop="180dp" android:textColor="#E71D1D" android:layout_marginLeft="35dp"/> <CheckBox android:id="@+id/cb_1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="电脑" android:textColor="#E71D1D" android:textSize="30sp" android:layout_marginTop="230dp" android:layout_marginLeft="35dp"/> <CheckBox android:id="@+id/cb_2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="手机" android:textColor="#E71D1D" android:textSize="30sp" android:layout_below="@id/cb_1" android:layout_marginTop="10dp" android:layout_marginLeft="35dp"/> </RelativeLayout>
.
4.
<?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"> <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="#551D1D"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_price" android:textSize="20sp" android:layout_marginTop="10dp" android:layout_below="@+id/title" android:textColor="#6B1919"/> <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:textColor="#8A435B" android:layout_marginTop="10dp"/> </RelativeLayout> </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 Main5Activity 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_main5); 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(Main5Activity.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; }
