Android传感器滚动列表RecyclerView
1. app gradle
dependencies {
implementation 'androidx.recyclerview:recyclerview:1.1.0'
2. activity布局
MainActivity
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
my_view
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
3. Activity代码
MainActivity
package com.example.mysensor;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private SensorManager sensorManager;
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private String[] myDataset = new String[]{};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerView);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
List<Sensor> allSensors = sensorManager.getSensorList(Sensor.TYPE_ALL);
Sensor sensor = null;
myDataset = new String[allSensors.size()];
for (int i = 0 ; i < allSensors.size(); i++ ) {
String sensorInfo = "";
sensor = allSensors.get(i);
sensorInfo += "Name: " + sensor.getName() +"\n";
sensorInfo += "Type: " + sensor.getType()+"\n";
sensorInfo += "Vendor: " + sensor.getVendor()+"\n";
sensorInfo += "Version: " + sensor.getVersion()+"\n";
sensorInfo += "Resolution: " + sensor.getResolution()+"\n";
sensorInfo += "Max: " + sensor.getMaximumRange()+"\n";
sensorInfo += "Power: " + sensor.getPower()+"\n";
myDataset[i] = sensorInfo;
}
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new MyAdapter(myDataset);
recyclerView.setAdapter(adapter);
}
}
MyAdapter
package com.example.mysensor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private String[] mDataset;
public static class MyViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public MyViewHolder(View v) {
super(v);
textView = v.findViewById(R.id.textView2);
}
}
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_view,parent,false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.textView.setText(mDataset[position]);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
4. 关键代码
//在布局中添加了 RecyclerView 微件之后,获取对象句柄,将其连接到布局管理器,并为要显示的数据附加适配器
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
recyclerView.setHasFixedSize(true);
// use a linear layout manager
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
// specify an adapter (see also next example)
adapter = new MyAdapter(myDataset);
recyclerView.setAdapter(adapter);
//要将所有数据输入列表中,您必须扩展 RecyclerView.Adapter 类。此对象会创建项的视图,并在原始项不再可见时用新数据项替换部分视图的内容。
//MyViewHolder参数需要是View,否则报错(TextView与String[]类型不匹配)
public MyViewHolder(View v) {
super(v);
textView = v.findViewById(R.id.textView);
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
参考链接:
https://developer.android.google.cn/guide/topics/ui/layout/recyclerview?hl=zh_cn#java
MyViewHolder参数需要是View,否则报错(TextView与String[]类型不匹配)
https://www.jianshu.com/p/4fc6164e4709
RecyclerView 的item显示的间距过大(item占满父布局)
https://www.jianshu.com/p/3047c050b556
传感器
https://www.runoob.com/w3cnote/android-tutorial-sensor1.html