机器人:为什么getrotationmatrix返回false? [英] android: why getrotationmatrix return false?
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问题描述
我要得到我的手机的方向,我已经使用这个code,我觉得很多人使用它。这是code
I want to get the orientation of my phone and I have using this code that I find lot of people using it. this is the code
public void onSensorChanged(SensorEvent event) {
//if the data sensor is unreliabel
if(event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE)
return;
//gets the value
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
gravity = event.values.clone();
break;
case Sensor.TYPE_MAGNETIC_FIELD:
geomag = event.values.clone();
break;
}
getOrientation();
}
private void getOrientation(){
//if gravity n geomag have value, find the rotation matrix
if(gravity != null && geomag != null){
//check the rotation matrix found
boolean success = SensorManager.getRotationMatrix(inR, I, gravity, geomag);
if(success){
SensorManager.getOrientation(inR, orientVals);
azimuth = Math.toDegrees(orientVals[0]);
TextView azi = (TextView) findViewById(R.id.textAzi);
azi.setText("azi : " + azimuth);
}
TextView cek = (TextView) findViewById(R.id.cek);
cek.setText("rotation: "+success);
}
但为什么getrotationmatrix随时返回假的? 问题出在哪里?
but why the getrotationmatrix always return to false? where is the problem?
推荐答案
我再试一次,并获得解决方案 但我改变code变成像下面的
I've try again and get the solution but I change the code to become like below
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
for(int i=0; i<3; i++){
accelValues[i] = event.values[i];
}
if(compassValues[0] != 0)
ready = true;
break;
case Sensor.TYPE_MAGNETIC_FIELD:
for(int i=0; i<3; i++){
compassValues[i] = event.values[i];
}
if(accelValues[2] != 0)
ready = true;
break;
}
if(!ready)
return;
boolean cek = SensorManager.getRotationMatrix(inR, inclineMatrix, accelValues, compassValues);
if(cek){
SensorManager.getOrientation(inR, prefValues);
mInclination = SensorManager.getInclination(inclineMatrix);
//display every 30th values
if(counter++ % 30 == 0){
//do your code, what you want to do to the result
counter = 1;
}
}
和一切工作得很好
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