[Android新手学习笔记25]-RecylerView简单应用
来源:互联网 发布:网络直播软件下载 编辑:程序博客网 时间:2024/06/06 01:41
使用前需要在app/build.gradle文件中添加如下内容:
compile 'com.android.support:recyclerview-v7:25.1.1'
注意25.1.1为版本,有要求,和上面版本填一样。
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.1'
compile 'com.android.support:recyclerview-v7:25.1.1'
testCompile 'junit:junit:4.12'
}
修改app/build.gradle文件时,会提示:
Gradle files have changed since last project sync. A project sync may be necessary for the IDE to work properly. Sync Now
点击Sync Now即可。
创建布局文件:fruit_item.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="wrap_content">
<ImageView
android:id="@+id/fruit_image"
android:layout_width="60dp"
android:layout_height="60dp" />
<TextView
android:id="@+id/fruit_name"
android:textSize="30sp"
android:gravity="center_vertical"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_marginLeft="10dp"
android:layout_height="60dp" />
</LinearLayout>
创建Fruit类:
public class Fruit {
private String name;
private int imageId;
public Fruit(String name, int imageId) {
this.name = name;
this.imageId = imageId;
}
public String getName() {
return this.name;
}
public int getImageId() {
return this.imageId;
}
}
创建FruitAdapter类,继承RecyclerView.Adapter<FruitAdapter.ViewHolder>:
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> mFruitList;
static class ViewHolder extends RecyclerView.ViewHolder {
ImageView fruitImage;
TextView fruitName;
public ViewHolder(View view) {
super(view);
fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
fruitName = (TextView) view.findViewById(R.id.fruit_name);
}
}
public FruitAdapter(List<Fruit> fruitList) {
mFruitList = fruitList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item, parent, false);
ViewHolder holder = new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitImage.setImageResource(fruit.getImageId());
holder.fruitName.setText(fruit.getName());
}
@Override
public int getItemCount() {
return mFruitList.size();
}
}
在MainActivity布局中引用fruit_item:
<?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">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
在MainActivity类中使用:
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initFruits();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(fruitList);
recyclerView.setAdapter(adapter);
}
private void initFruits() {
Fruit strawberry = new Fruit("草莓", R.drawable.strawberry);
fruitList.add(strawberry);
Fruit pear = new Fruit("梨", R.drawable.pear);
fruitList.add(pear);
Fruit mango = new Fruit("芒果", R.drawable.mango);
fruitList.add(mango);
Fruit apple = new Fruit("苹果", R.drawable.apple);
fruitList.add(apple);
Fruit watermelon = new Fruit("西瓜", R.drawable.watermelon);
fruitList.add(watermelon);
Fruit banana = new Fruit("香蕉", R.drawable.banana);
fruitList.add(banana);
Fruit cherry = new Fruit("樱桃", R.drawable.cherry);
fruitList.add(cherry);
}
}
创建横向滚动:
改变fruit_itme:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="60dp"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/fruit_image"
android:layout_gravity="center_horizontal"
android:layout_width="60dp"
android:layout_height="60dp" />
<TextView
android:id="@+id/fruit_name"
android:textSize="20sp"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:layout_width="60dp"
android:layout_marginTop="10dp"
android:layout_height="60dp" />
</LinearLayout>
修改LinearLayoutManager:
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
创建瀑布流:
这里创建的横向垂直瀑布流,高度不一致效果明显。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_margin="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/fruit_image"
android:layout_gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/fruit_name"
android:textSize="20sp"
android:layout_gravity="left"
android:gravity="center"
android:layout_width="wrap_content"
android:layout_marginTop="10dp"
android:layout_height="wrap_content" />
</LinearLayout>
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initFruits();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(fruitList);
recyclerView.setAdapter(adapter);
}
private void initFruits() {
Fruit strawberry = new Fruit(getRandomLengthName("草莓"), R.drawable.strawberry);
fruitList.add(strawberry);
Fruit pear = new Fruit(getRandomLengthName("梨"), R.drawable.pear);
fruitList.add(pear);
Fruit mango = new Fruit(getRandomLengthName("芒果"), R.drawable.mango);
fruitList.add(mango);
Fruit apple = new Fruit(getRandomLengthName("苹果"), R.drawable.apple);
fruitList.add(apple);
Fruit watermelon = new Fruit(getRandomLengthName("西瓜"), R.drawable.watermelon);
fruitList.add(watermelon);
Fruit banana = new Fruit(getRandomLengthName("香蕉"), R.drawable.banana);
fruitList.add(banana);
Fruit cherry = new Fruit(getRandomLengthName("樱桃"), R.drawable.cherry);
fruitList.add(cherry);
}
private String getRandomLengthName(String name) {
Random random = new Random();
int length = random.nextInt(100) + 1;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < length; ++i) {
builder.append(name);
}
return builder.toString();
}
}
点击事件:
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> mFruitList;
static class ViewHolder extends RecyclerView.ViewHolder {
View fruitView;
ImageView fruitImage;
TextView fruitName;
public ViewHolder(View view) {
super(view);
fruitView = view;
fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
fruitName = (TextView) view.findViewById(R.id.fruit_name);
}
}
public FruitAdapter(List<Fruit> fruitList) {
mFruitList = fruitList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item, parent, false);
final ViewHolder holder = new ViewHolder(view);
holder.fruitView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "你点击了" + fruit.getName() +"的名字", Toast.LENGTH_SHORT).show();
}
});
holder.fruitImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "你点击了" + fruit.getName() + "的图片", Toast.LENGTH_SHORT).show();
}
});
return holder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitImage.setImageResource(fruit.getImageId());
holder.fruitName.setText(fruit.getName());
}
@Override
public int getItemCount() {
return mFruitList.size();
}
}
0 0
- [Android新手学习笔记25]-RecylerView简单应用
- [Android新手学习笔记26]-Fragment简单例子
- Android基础学习之RecylerView学习
- Android学习笔记_46_fragment的简单应用
- 新手Android学习笔记 04
- RecylerView 的应用
- recylerview的简单使用
- Android开发新手学习笔记(一)
- Android新手学习笔记-startActivity(intent);
- [Android新手学习笔记07]-AndroidMainfest配置
- [Android新手学习笔记21]-百分比布局
- [Android新手学习笔记34]-Storage-SharedPreferences
- [Android新手学习笔记35]-Storage-SQLite
- [Android新手学习笔记36]-Storage-LitePal
- Android学习笔记09:Paint及Canvas的简单应用
- Android学习笔记09:Paint及Canvas的简单应用
- Android学习笔记09:Paint及Canvas的简单应用
- Android学习笔记09:Paint及Canvas的简单应用
- 如何理解RESTful的幂等性
- Android-使用GET、POST、AsyncHttpClient向服务器提交数据
- 430的复位及复位电路
- poj1149(*网络流建模方法,paper题)
- 读书笔记 effective c++ Item 8 不要让异常(exceptions)离开析构函数
- [Android新手学习笔记25]-RecylerView简单应用
- JAVA栈帧
- (50)Java学习笔记——GUI
- Git 版本回退2
- 解决 libdl.so.2 not find
- 欢迎使用CSDN-markdown编辑器
- centos7下jenkins配置docker插件
- Linux服务管理
- Activiti 流程启动及节点流转源码分析