我正在尝试在文件上写下传感器的读数。我有这个代码..我需要看到我正在写的数据，但我不知道如何访问它。我下载了文件管理器for android wear但它不允许我进入Storage文件夹。以下是我的代码，希望你能帮助它
public class Logging extends Activity implements SensorEventListener {
DecimalFormat df =new DecimalFormat("##.##");
public static final String file=("Project.txt");
Boolean flag=true;
FileOutputStream outputStream;
TextView displayReading1;
TextView displayReading2;
TextView displayReading3;
TextView displayReading4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_logging);
Button start=(Button)findViewById(R.id.StartButton);
Button stop=(Button)findViewById(R.id.StopButton);
//BUTTON START
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
flag=true;
}
}); {
}
//BUTTON STOP
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
flag=false;
}
});{
}
SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
Sensor accSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
Sensor rotSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);
Sensor gravitySensor = sensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
Sensor gyroSensor = sensorManager.getDefaultSensor((Sensor.TYPE_GYROSCOPE));
sensorManager.registerListener(this, accSensor, 100000);
sensorManager.registerListener(this, rotSensor, 100000);
sensorManager.registerListener(this, gravitySensor, 100000);
sensorManager.registerListener(this, gyroSensor, 100000);
displayReading1 = (TextView) findViewById(R.id.acc_sensor);
displayReading2 = (TextView) findViewById(R.id.rotational_sensor);
displayReading3 = (TextView) findViewById(R.id.gravity_sensor);
displayReading4 = (TextView) findViewById(R.id.gyro_sensor);
displayReading1.setTextSize(14f);
displayReading2.setTextSize(14f);
displayReading3.setTextSize(14f);
displayReading4.setTextSize(14f);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_logging, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
displayReading1.setText("Accelerometer (m/s2): " +"\nX"+" " +df.format(event.values[0]) + "\nY"+" " + df.format(event.values[1]) + "\nZ"+" " + df.format(event.values[2]));
float X11=event.values[0];
float X12=event.values[1];
float X13=event.values[2];
if( flag) {
try {
outputStream = openFileOutput(file, Context.MODE_PRIVATE);
outputStream.write(("Accelerometer (m/s2): " + "\nX" + " " + df.format(X11) + "\nY" + " " + df.format(X12) + "\nZ" + " " + df.format(X13)
).getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException f) {
System.out.println("Exception");
}
}
if (event.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR)
displayReading2.setText("Rotational Vector: " + "\nX"+" " + df.format(event.values[0]) + "\nY"+" " + df.format(event.values[1]) + "\nZ"+" " + df.format(event.values[2]));
float X21=event.values[0];
float X22=event.values[1];
float X23=event.values[2];
if( flag) {
try {
outputStream=openFileOutput(file, Context.MODE_PRIVATE);
outputStream.write(("Rotational Vector : " +"\nX"+" " +df.format(X21) + "\nY"+" " + df.format(X22) + "\nZ"+" " + df.format(X23)).getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException f) {
System.out.println("Exception");
}}
if (event.sensor.getType() == Sensor.TYPE_GRAVITY)
displayReading3.setText("Gravity (m/s2): " + "\nX"+" " + df.format(event.values[0]) + "\nY"+" " + df.format(event.values[1]) + "\nZ"+" " + df.format(event.values[2]));
if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE)
displayReading4.setText("Gyroscope (rad/s): " + "\nX"+" " + df.format(event.values[0]) + "\nY"+" " + df.format(event.values[1]) + "\nZ"+" " + df.format(event.values[2]));
float X31=event.values[0];
float X32=event.values[1];
float X33=event.values[2];
if( flag) {
try {
outputStream = openFileOutput(file, Context.MODE_PRIVATE);
outputStream.write(("Gyroscope (rad/s): " + "\nX" + " " + df.format(X31) + "\nY" + " " + df.format(X32) + "\nZ" + " " + df.format(X33)
).getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException f) {
System.out.println("Exception");
}
}
if (!flag){
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
答案 0 :(得分：1)
这取决于您尝试访问的文件存储。我已将它用于Android和Android Wear。这将访问应用程序的文档目录，该目录只能从应用程序访问，而不能由其他应用程序访问。当我使用它进行内部存储时，也会共享该代码。
这只是一个烤面包，逐个显示此目录中的所有文件：
public void listFiles(View view) {
PackageManager m = getPackageManager();
String s = getPackageName();
try {
PackageInfo p = m.getPackageInfo(s, 0);
s = p.applicationInfo.dataDir;
} catch (PackageManager.NameNotFoundException e) {
Log.w("yourtag", "Error Package name not found ", e);
}
Context context = getApplicationContext();
File folder = new File(context.getFilesDir().toString());
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
Toast.makeText(MainActivity.this, "File " + listOfFiles[i].getName(),
Toast.LENGTH_SHORT).show();
//System.out.println("File " + listOfFiles[i].getName());
} else if (listOfFiles[i].isDirectory()) {
Toast.makeText(MainActivity.this, "File " + listOfFiles[i].getName(),
Toast.LENGTH_SHORT).show();
//System.out.println("Directory " + listOfFiles[i].getName());
}
}
}
这也是将文件保存到手表的外部存储器中，可以通过其他应用程序访问：
private final String fileName = "aq.pcm";
private String TAGFILE = "ExternalFileWriteReadActivity";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
// Enables Ambient mode.
mAmbientController = AmbientMode.attachAmbientSupport(this);
//Copy files
if (Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState())) {
File outFile = new File(
getExternalFilesDir(Environment.DIRECTORY_PICTURES),
fileName);
if (!outFile.exists())
copyImageToMemory(outFile);
}
}
// Copy file methods
private void copyImageToMemory(File outFile) {
try {
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream(outFile));
BufferedInputStream is = new BufferedInputStream(getResources()
.openRawResource(R.raw.sound));
copy(is, os);
} catch (FileNotFoundException e) {
Log.e(TAGFILE, "FileNotFoundException");
}
}
private void copy(InputStream is, OutputStream os) {
final byte[] buf = new byte[1024];
int numBytes;
try {
while (-1 != (numBytes = is.read(buf))) {
os.write(buf, 0, numBytes);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
os.close();
} catch (IOException e) {
Log.e(TAGFILE, "IOException");
}
}
}