我建立我的第一个应用程序,我希望当按下按钮,手机不动,让我的手机的方向。用户可以看到后视摄像头的观点,然后按下按钮即可获取角度。调用getOrientation()导致崩溃
当我在onSensorChanged
(我用作示例代码:finding orientation using getRotationMatrix() and getOrientation())中使用代码时,代码似乎可以正常工作,但是在'onClick'中使用它时会崩溃。
我想其他的计算(我做了间距全局变量)的螺距值。 这里是我的onClick
代码:
public void onClick(View arg0)
{
camera.takePicture(myShutterCallback,
myPictureCallback_RAW, myPictureCallback_JPG);
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
gravity = event.values.clone();
break;
case Sensor.TYPE_MAGNETIC_FIELD:
magnet = event.values.clone();
break;
}
if(gravity!=null && magnet!=null) {
rotMatrix = SensorManager.getRotationMatrix(inR, I, gravity, magnet);
SensorManager.remapCoordinateSystem(inR,
SensorManager.AXIS_X, SensorManager.AXIS_Z, outR);
SensorManager.getOrientation(outR, orientVals);
float azimuth = orientVals[0]*rad2deg;
pitch = orientVals[1]*rad2deg;
float roll = orientVals[2]*rad2deg;
TextView rezDisplay = (TextView) findViewById(R.id.finalRezult);
rezDisplay.setText("Atstumas iki objekto yra:" + pitch + "m");
}
}
任何建议,链接,例子或TUTS将是巨大的。
编辑:
我添加了整个班级代码。
import java.io.IOException;
import com.mindjack.measuremydistance.SensorEvnt.mSensorEventListener;
import android.app.Activity;
//import android.content.Intent;
import android.content.Context;
import android.content.pm.ActivityInfo;
//import android.graphics.Bitmap;
//import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorManager;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.TextView;
public class AndroidCamera extends Activity implements SurfaceHolder.Callback
{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;
TextView display, display1;
float[] magnet = new float[3];
float[] gravity = new float[3];
SensorEvent event;
boolean rotMatrix;
float[] outR = new float[16];
float[] inR = new float[16];
float[] I = new float[16];
float[] orientVals = new float[3];
final float pi = (float) Math.PI;
final float rad2deg = 180/pi;
float pitch;
SensorManager mSensorManager;
/** Called when the activity is first created. */
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.andcam);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.surfaceview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
controlInflater = LayoutInflater.from(getBaseContext());
View viewControl = controlInflater.inflate(R.layout.control, null);
LayoutParams layoutParamsControl
= new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
this.addContentView(viewControl, layoutParamsControl);
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Button buttonTakePicture = (Button)findViewById(R.id.takepicture);
buttonTakePicture.setOnClickListener(new Button.OnClickListener() {
// TODO Auto-generated method stub
@Override
public void onClick(View arg0) {
camera.takePicture(myShutterCallback,
myPictureCallback_RAW, myPictureCallback_JPG);
switch (event.sensor.getType()){
case Sensor.TYPE_ACCELEROMETER:
gravity = event.values.clone();
break;
case Sensor.TYPE_MAGNETIC_FIELD:
magnet = event.values.clone();
break;
}
//if(gravity!=null && magnet!=null){
rotMatrix = SensorManager.getRotationMatrix(inR,
I, gravity, magnet);
SensorManager.remapCoordinateSystem(inR,
SensorManager.AXIS_X, SensorManager.AXIS_Z, outR);
SensorManager.getOrientation(outR, orientVals);
float azimuth = orientVals[0]*rad2deg;
pitch = orientVals[1]*rad2deg;
float roll = orientVals[2]*rad2deg;
// }
TextView rezDisplay = (TextView) findViewById(R.id.finalRezult);
rezDisplay.setText("Atstumas iki objekto yra:" + pitch + "m");
}
});
}
ShutterCallback myShutterCallback = new ShutterCallback() {
@Override
public void onShutter() {
// TODO Auto-generated method stub
}
};
PictureCallback myPictureCallback_RAW = new PictureCallback() {
@Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
}
};
PictureCallback myPictureCallback_JPG = new PictureCallback() {
@Override
public void onPictureTaken(byte[] arg0, Camera arg1) {
// TODO Auto-generated method stub
//Bitmap bitmapPicture
//= BitmapFactory.decodeByteArray(arg0, 0, arg0.length);
}
};
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height)
{
// TODO Auto-generated method stub
if(previewing) {
camera.stopPreview();
previewing = false;
}
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
previewing = false;
}
}
由于我是新的可能会有一些愚蠢的错误,但我无法弄清楚这种情况。 LogCat说它在第84行崩溃了。我试图从第84行取出零件直到91,然后它不会崩溃,但是在音高值上也给出了0。
发布logcat – Blackbelt
是的,因为你是android dev的新手,logcat会向你显示崩溃和错误报告的堆栈跟踪。 Eclipse应该有它或做“adb logcat”。 – spartygw
我设法发现那部分崩溃是: 'switch(event.sensor.getType()){ case Sensor.TYPE_ACCELEROMETER: gravity = event.values.clone(); 休息; case Sensor.TYPE_MAGNETIC_FIELD: magnet = event.values.clone(); 休息; }” 也许任何想法,为什么或如何让不同的方式的价值观? –