Question

我想编写csv文件，包括android应用程序中的source注意到的信息。我在android studio中写了源代码，如下图所示。我不知道如何编辑该源以执行我想要的操作。如果我实现该应用程序，tv_ax中的消息是错误：\ SD卡\模拟\ 0 \ AndroSensor \ output.csv 打开失败：EROFS（只读文件系统）请帮我。感谢您阅读我的文章。

＆＃13;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.opencsv.*;

public class MainActivity extends Activity implements SensorEventListener  {
    TextView tv_ax;
    Button bt_load=null;//Load button
    Button bt_load_end=null;// Load quit button
    SensorManager sm=null; 
    Sensor accSensor=null;
    String csv = "\\storage\\emulated\\0\\AndroSensor\\output.csv";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sm=(SensorManager)getSystemService(SENSOR_SERVICE);
        accSensor= sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        tv_ax=(TextView)findViewById(R.id.Tv_AX);
        bt_load=(Button)findViewById(R.id.bt_load);
        bt_load_end=(Button)findViewById(R.id.bt_load_end);
        bt_load.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sensor_listener();// To register sensor
            }
        });
    }

 private void sensor_listener() {
   sm.registerListener(this, accSensor, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override 
    public void onSensorChanged(SensorEvent event) {
        switch (event.sensor.getType()) {
            case Sensor.TYPE_ACCELEROMETER:
                try {
               CSVWriter writer;
               writer = new CSVWriter(new FileWriter(csv));
               List<String[]> data=new ArrayList<String[]>();
               data.add(new String[] {String.valueOf(" X축:"+(int)event.values[0])});
               data.add(new String[]{ String.valueOf(" Y축:" + (int) event.values[1])});
               data.add(new  String[]{ String.valueOf(" Z축:" + (int) event.values[2])});
               writer.writeAll((List<String[]>) data);
               writer.close();
             } catch (IOException e) {
                      // TODO Auto-generated catch block
                     tv_ax.setText("ERROR:"+e.getMessage());
             }
                break;
        }
    }
    @Override 
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
}

＆＃13;

我想在android中编写csv文件[附件源码]

0 个答案: