第五，六周作业
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/btn_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="click1"
android:text="按钮1" />
<Button
android:id="@+id/btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="42dp"
android:text="按钮2" />
</LinearLayout>
package com.example.a;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
@SuppressWarnings("unused")
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn2 = (Button) findViewById(R.id.btn_2);
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按钮2被点击", 0).show(); }
});
}
public void click1(View v) {
Toast.makeText(this, "按钮1被点击", 0).show();
}
public void onBackPressed() {
AlertDialog dialog;
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(R.drawable.ic_launcher);
builder.setTitle("普通对话框");
builder.setMessage("是否退出应用程序？");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
MainActivity.this.finish();
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog = builder.create();
dialog.show();
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="单选对话框"
android:layout_marginTop="10dp"
android:textSize="20sp"
android:textColor="#FFFDB371"/>
<Button
android:id="@+id/bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"
android:layout_marginTop="20dp"
android:layout_gravity="center"/>
<Button
android:id="@+id/bt2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:layout_marginTop="20dp"
android:layout_gravity="center"/>
</LinearLayout>
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>
<?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"
tools:context=".Main8Activity">
<TextView
android:layout_width="match_parent"
android:layout_height="45dp"
android:text="购物商城"
android:textSize="18sp"
android:background="#FF8F03"
android:gravity="center"/>
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
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.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class Main8Activity 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/kg", "300元", "350元", "10/kg", "280元"};
private int[] icons = {R.drawable.table, R.drawable.apple, R.drawable.dangao, R.drawable.maoyi, R.drawable.mihoutao, R.drawable.weijin};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main8);
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 i) {
return titles[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = View.inflate(Main8Activity.this, R.layout.list_item, null);
TextView title = view.findViewById(R.id.title1);
TextView price = view.findViewById(R.id.price);
ImageView iv = view.findViewById(R.id.iv);
title.setText(titles[i]);
price.setText(prices[i]);
iv.setImageResource(icons[i]);
return view;
}
}
}
