【android编程】Android高级组件实践题
文章目录
1. 列表和列表视图ListView
1. 布局文件activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="26dp"
android:text="我喜欢的教科书"/>
<ListView
android:id="@+id/list0"
android:entries="@array/item0"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
2. array.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="item0">
<item>第一行代码Android</item>
<item>Android开发与实践</item>
<item>疯狂Android讲义</item>
<item>精通Android Studio</item>
</string-array>
</resources>
3. java文件
package com.example.bean.myapplication39v1;
import android.app.Activity;
import android.app.ListActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] data = new String[]{"第一行代码Android","Android开发与实践","疯狂Android讲义","精通Android Studio"};
ListView listView;
ArrayAdapter<String> adapter;
adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice,data);
//setListAdapter(adapter);
listView = (ListView) findViewById(R.id.list0);
listView.setAdapter(adapter);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//通过下标来获取内容
String str = parent.getItemAtPosition(position).toString();
Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
//position 数据的下标 id 数据的id
//Toast.makeText(MainActivity.this, "position="+position+"id="+id, Toast.LENGTH_SHORT).show();
}
});
}
}
4. 结果展示
2. 网格视图 GridView练习
1. activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<GridView
android:id="@+id/grid0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="4">
</GridView>
</LinearLayout>
2. items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:paddingLeft="10dp"
android:scaleType="fitCenter"
android:layout_width="wrap_content"
android:layout_height="150dp" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:padding="5dp"
android:layout_gravity="center"/>
</LinearLayout>
3. MainActivity.java
package com.example.bean.myapplicationv2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
private int[] imageId = new int[]{R.drawable.m1,R.drawable.m2,R.drawable.m3,
R.drawable.m4,R.drawable.m5,R.drawable.m6,R.drawable.m7,R.drawable.m8,
R.drawable.m9,R.drawable.m10,R.drawable.m11,R.drawable.m12};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//View view= this.getLayoutInflater().inflate(R.layout.activity_main, null);
GridView gridview = (GridView)findViewById(R.id.grid0);
String[] title = new String[]{"mm1","mm2","mm3","mm4","mm5","mm6","mm7","mm8",
"mm9","mm10","mm11","mm12"};
List<Map<String,Object>> listitem = new ArrayList<Map<String, Object>>();
for(int i=0;i<imageId.length;i++){
Map<String,Object> map = new HashMap<String, Object>();
map.put("image",imageId[i]);
map.put("title",title[i]);
listitem.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this,listitem,
R.layout.items,
new String[]{"title","image"},
new int[]{R.id.title,R.id.image});
gridview.setAdapter(adapter);
}
}
4. 结果展示
3. 有图片的ListView列表视图
1.使用所给的水果图片完成有5个选项的ListView。
2.为ListView添加消息响应，在单击某项时，用Toast显示“我喜欢……”，参见附件中的截图。
3.上传基本界面和每项点击后的结果共6张图片或程序运行视频。
1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="@+id/tv0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我喜欢的水果"
android:textSize="60dp" />
<ListView
android:id="@+id/list0"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
2. items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:paddingBottom="10dp"
android:maxWidth="100dp"
android:maxHeight="100dp"
android:adjustViewBounds="true" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="40dp"
android:padding="24dp"/>
</LinearLayout>
3.MainActivity.java
package com.example.bean.myapplication39v3;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
List<Map<String, Object>> listitem = new ArrayList<Map<String, Object>>();
int[] images = new int[]{R.drawable.apple,R.drawable.banana,R.drawable.blueberry
,R.drawable.lemon,R.drawable.pear,R.drawable.pineapple,R.drawable.watermelon};
String[] title = new String[]{"苹果","香蕉","蓝莓","柠檬","梨","菠萝","西瓜"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
for (int i = 0; i < images.length; i++)
{
Map<String, Object> map = new HashMap<String, Object>();
map.put("images", images[i]);
map.put("title", title[i]);
listitem.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this
, listitem
, R.layout.items
, new String[]{"images", "title"}
, new int[]{R.id.image, R.id.title});
ListView listView = (ListView) findViewById(R.id.list0);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//通过下标来获取内容
//String str = parent.getItemAtPosition(position).toString();
String str = parent.getItemAtPosition(position).toString();
String mmp = "我喜欢" + title[position] + "!";
Toast.makeText(MainActivity.this, mmp, Toast.LENGTH_SHORT).show();
}
});
}
}
4.结果展示
