目前我正在学习在Android开发中使用SensorManager，但每次我在三星Galaxy S3上测试它时，应用程序崩溃，我必须断开连接并重新启动手机。屏幕旋转已启用，之前我对其他程序没有任何问题。它在我尝试使用SensorManager时开始。
这是我尝试测试的程序：
import java.math.BigDecimal;
import android.app.Activity;
import android.os.Bundle;
import android.content.*;
import android.content.res.*;
import android.graphics.*;
import android.view.*;
import android.content.pm.ActivityInfo;
import android.renderscript.*;
import android.hardware.*;
public class Game extends Activity implements SensorEventListener {
DrawView drawView;
SensorManager sensors;
Sensor linear=null;
String title="Linear Acceleration Sensor Demo";
Float3 data = new Float3(0,0,0);
Float3 min = new Float3(0,0,0);
Float3 max = new Float3(0,0,0);
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
drawView = new DrawView(this);
setContentView(drawView);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
//initialize sensors
sensors = (SensorManager)getSystemService(SENSOR_SERVICE);
//try to get linear acceleration sensor
linear = sensors.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);
if (linear==null)
title = "ERROR: NO LINEAR ACCELERATION SENSOR WAS FOUND";
}
@Override public void onSensorChanged(SensorEvent event) {
switch (event.sensor.getType()) {
case Sensor.TYPE_LINEAR_ACCELERATION:
//get X value and save limits
data.x = event.values[0];
if (data.x < min.x) min.x = data.x;
if (data.x > max.x) max.x = data.x;
//get Y value and save limits
data.y = event.values[1];
if (data.y < min.y) min.y = data.y;
if (data.y > max.y) max.y = data.y;
break;
}
}
@Override public void onAccuracyChanged(Sensor arg0, int arg1) {
}
@Override public void onResume() {
super.onResume();
drawView.resume();
//enable the sensor
sensors.registerListener(this, linear, SensorManager.
SENSOR_DELAY_NORMAL);
}
@Override public void onPause() {
super.onPause();
drawView.pause();
//disable the sensor
sensors.unregisterListener(this);
}
public class DrawView extends SurfaceView implements Runnable
{
Thread gameloop = null;
SurfaceHolder surface = null;
volatile boolean running = false;
AssetManager assets = null;
Paint paint = new Paint();
Float2 center;
//constructor method
public DrawView(Context context) {
super(context);
surface = getHolder();
assets = context.getAssets();
}
public void resume() {
running = true;
gameloop = new Thread(this);
gameloop.start();
}
public void pause() {
running = false;
while (true) {
try {
gameloop.join();
}
catch (InterruptedException e) { }
}
}
//thread run method
@Override public void run() {
while (running) {
if (!surface.getSurface().isValid()) continue;
//open the canvas for drawing
Canvas canvas = surface.lockCanvas();
//clear the screen
canvas.drawColor(Color.BLACK);
int centerx = canvas.getWidth()/2;
int centery = canvas.getHeight()/2;
int top = centery-100;
int bottom = centery+100;
paint.setColor(Color.WHITE);
canvas.drawLine(centerx, top, centerx, bottom, paint);
int minColor = Color.argb(100, 200, 0, 0);
int maxColor = Color.argb(100, 0, 200, 0);
//draw bar for -X minimum (RIGHT)
int range = (int)Math.abs(min.x)*10;
Rect rect = new Rect(centerx, centery-30, centerx+range,
centery+30);
paint.setColor(minColor);
canvas.drawRect(rect, paint);
//draw bar for +X maximum (LEFT)
range = (int)Math.abs(max.x)*10;
rect = new Rect(centerx-range, centery-30, centerx,
centery+30);
paint.setColor(maxColor);
canvas.drawRect(rect, paint);
//draw bar for -Y minimum (UP)
range = (int)Math.abs(min.y)*10;
rect = new Rect(centerx-30, centery-range, centerx+30,
centery);
paint.setColor(minColor);
canvas.drawRect(rect, paint);
//draw bar for +Y maximum (DOWN)
range = (int)Math.abs(max.y)*10;
rect = new Rect(centerx-30, centery, centerx+30,
centery+range);
paint.setColor(maxColor);
canvas.drawRect(rect, paint);
//draw bar for ACTUAL Y
range = (int)data.y*10;
if (range < 0) {
//range is negative here
rect = new Rect(centerx-30, centery+range, centerx+30,
centery);
paint.setColor(Color.RED);
}
else if (range > 0) {
//range is positive here
rect = new Rect(centerx-30, centery, centerx+30,
centery+range);
paint.setColor(Color.GREEN);
}
canvas.drawRect(rect, paint);
//draw bar for ACTUAL X
range = (int)data.x*10;
if (range < 0) {
//range is negative here
rect = new Rect(centerx, centery-30, centerx-range,
centery+30);
paint.setColor(Color.RED);
}
else if (range > 0) {
//range is positive here
rect = new Rect(centerx, centery-30, centerx-range,
centery+30);
paint.setColor(Color.GREEN);
}
canvas.drawRect(rect, paint);
//display sensor info
paint.setColor(Color.WHITE);
paint.setTextSize(24);
canvas.drawText(title, 10, 20, paint);
canvas.drawText("Model: " + linear.getVendor(), 10, 50,
paint);
canvas.drawText("Data: " + toString(data), 10, 80, paint);
canvas.drawText("Min: " + toString(min), 10, 110, paint);
canvas.drawText("Max: " + toString(max), 10, 140, paint);
//close the canvas
surface.unlockCanvasAndPost(canvas);
try {
Thread.sleep(20);
}
catch(InterruptedException e) {
e.printStackTrace();
}
}
}
public String toString(int value) {
return Integer.toString(value);
}
public String toString(Float3 value) {
String s = "X:" + round(value.x) + "," +
"Y:" + round(value.y) + "," +
"Z:" + round(value.z);
return s;
}
//round to a default 2 decimal places
public double round(double value) {
return round(value,2);
}
//round a number to any number of decimal places
public double round(double value, int precision) {
BigDecimal bd = new BigDecimal(value);
BigDecimal rounded = bd.setScale(precision,
BigDecimal.ROUND_HALF_UP);
return rounded.doubleValue();
}
}
}
Min SDK版本为13，因此不应该是问题。
LogCat说：
01-15 13:44:21.549: E/SELinux(7000): Function: selinux_android_load_priority [0], There is no sepolicy file
01-15 13:44:21.549: E/SELinux(7000):
01-15 13:44:21.549: E/SELinux(7000): Function: selinux_android_load_priority , loading version is VE=SEPF_GT-I9305_4.3_0021
01-15 13:44:21.549: E/SELinux(7000):
01-15 13:44:21.549: E/SELinux(7000):
01-15 13:44:21.549: E/SELinux(7000): selinux_android_seapp_context_reload: seapp_contexts file is loaded from /data/security/spota/seapp_contexts
01-15 13:44:21.554: D/dalvikvm(7000): Late-enabling CheckJNI
01-15 13:44:21.569: I/dalvikvm(7000): Turning on JNI app bug workarounds for target SDK version 13...
01-15 13:44:21.634: W/ActivityThread(7000): Application android.program can be debugged on port 8100...
01-15 13:44:22.134: D/SensorManager(7000): registerListener :: create queue :: handler = 7, name = iNemoEngine Linear Acceleration sensor, delay = 200000,
之前从未见过这种类型的LogCat，所以我发现很难解读它的含义。这是某种硬件问题吗？