使用广播摇晃时启动应用程序
Starting app when it shakes using broadcast
我想要的是当我的应用程序在后台并且我摇动 phone 应用程序应该启动并出现在前台！
为了实现这一点，我使用了如下广播接收器：
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
mSensorManager = (SensorManager) arg0.getSystemService(arg0.SENSOR_SERVICE);
mSensorManager.registerListener( mSensorIntentListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
}
我也注册了如下:
<receiver
android:name=".BootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
现在对于摇动事件，我使用下面给出的代码：
private final SensorEventListener mSensorIntentListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
现在，当我尝试 运行 应用并将其置于后台并摇动它时，它不起作用！
那么什么是逻辑错误以及如何使我的应用在摇动时出现在前台？
还有一件事我正在使用嵌套 classes 概念，所以所有 classes 都在 MainActivity class !
代码已满！
:
package com.example.sensorlist;
public class MainActivity extends ActionBarActivity {
TextView tv1=null;
static File file = null;
private String outputFile = null;
private float mAccel; // acceleration apart from gravity
private float mAccelCurrent; // current acceleration including gravity
private float mAccelLast; // last acceleration including gravity
Button play,stop,record;
MediaRecorder myAudioRecorder;
public SensorManager mSensorManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play=(Button)findViewById(R.id.button3);
stop=(Button)findViewById(R.id.button2);
record=(Button)findViewById(R.id.button);
stop.setEnabled(false);
play.setEnabled(false);
final File path =
Environment.getExternalStoragePublicDirectory
(
//Environment.DIRECTORY_PICTURES
//Environment.DIRECTORY_DCIM
Environment.DIRECTORY_DCIM + "/Utkarshrecord/"
);
// Make sure the sound directory exists.
if(!path.exists())
{
path.mkdirs();
}
try {
file= File.createTempFile("sound", ".3gp", path);
myAudioRecorder=new MediaRecorder();
myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myAudioRecorder.setOutputFile(file.getAbsolutePath());
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
if( mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)!=null){
Toast.makeText(getBaseContext(), "Yes it is there ", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getBaseContext(), "Sry no accelerometer", Toast.LENGTH_LONG).show();
}
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
mAccel = 0.00f;
mAccelCurrent = SensorManager.GRAVITY_EARTH;
mAccelLast = SensorManager.GRAVITY_EARTH;
record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
myAudioRecorder.prepare();
myAudioRecorder.start();
}
catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
record.setEnabled(false);
stop.setEnabled(true);
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) throws IllegalArgumentException,SecurityException,IllegalStateException {
try{
myAudioRecorder.stop();
myAudioRecorder.release();
myAudioRecorder = null;
}catch(Exception e){
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "Audio recorded successfully",Toast.LENGTH_LONG).show();
stop.setEnabled(false);
play.setEnabled(true);
}
});
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) throws IllegalArgumentException,SecurityException,IllegalStateException {
MediaPlayer m = new MediaPlayer();
try {
m.setDataSource(file.getAbsolutePath());
m.prepare();
}
catch (IOException e) {
e.printStackTrace();
}
m.start();
Toast.makeText(getApplicationContext(), "Playing audio", Toast.LENGTH_LONG).show();
}
});
}
private final SensorEventListener mSensorListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
try {
myAudioRecorder.prepare();
myAudioRecorder.start();
record.setEnabled(false);
stop.setEnabled(true);
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(getBaseContext(), "recording has started", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
private final SensorEventListener mSensorIntentListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
@Override
protected void onPause() {
mSensorManager.unregisterListener(mSensorListener);
super.onPause();
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public class ShakeRec extends Service{
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
return super.onStartCommand(intent, flags, startId);
}
}
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
mSensorManager = (SensorManager) arg0.getSystemService(arg0.SENSOR_SERVICE);
mSensorManager.registerListener( mSensorIntentListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
}
}
您的 <receiver> 元素将不起作用。如果您要在重新启动时查看 LogCat，您会看到来自 Android 的警告或错误，说它找不到您的 BootReceiver class。清单注册接收器不能是 activity 内的嵌套 class。
删除 <receiver> 元素。去掉 BootReceiver。在 activity 的 onCreate() 中注册您的 SensorEventListener。只要您的进程是 运行（可能不会很长），并且只要设备处于打开状态，您就应该收到传感器事件。
要捕捉震动，您应该使用始终开启的低功耗传感器，并在唤醒锁定的粘性服务中注册。要覆盖大量设备，您的应用应该找到 phone 中可用的低功率传感器。然后使用最佳组合，最大限度地减少电池电量消耗。您还需要确保您的应用已列入电池优化白名单，这样您的应用才能在后台运行。
我想要的是当我的应用程序在后台并且我摇动 phone 应用程序应该启动并出现在前台！
为了实现这一点，我使用了如下广播接收器：
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
mSensorManager = (SensorManager) arg0.getSystemService(arg0.SENSOR_SERVICE);
mSensorManager.registerListener( mSensorIntentListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
}
我也注册了如下:
<receiver
android:name=".BootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
现在对于摇动事件，我使用下面给出的代码：
private final SensorEventListener mSensorIntentListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
现在，当我尝试 运行 应用并将其置于后台并摇动它时，它不起作用！
那么什么是逻辑错误以及如何使我的应用在摇动时出现在前台？
还有一件事我正在使用嵌套 classes 概念，所以所有 classes 都在 MainActivity class !
代码已满！ :
package com.example.sensorlist;
public class MainActivity extends ActionBarActivity {
TextView tv1=null;
static File file = null;
private String outputFile = null;
private float mAccel; // acceleration apart from gravity
private float mAccelCurrent; // current acceleration including gravity
private float mAccelLast; // last acceleration including gravity
Button play,stop,record;
MediaRecorder myAudioRecorder;
public SensorManager mSensorManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play=(Button)findViewById(R.id.button3);
stop=(Button)findViewById(R.id.button2);
record=(Button)findViewById(R.id.button);
stop.setEnabled(false);
play.setEnabled(false);
final File path =
Environment.getExternalStoragePublicDirectory
(
//Environment.DIRECTORY_PICTURES
//Environment.DIRECTORY_DCIM
Environment.DIRECTORY_DCIM + "/Utkarshrecord/"
);
// Make sure the sound directory exists.
if(!path.exists())
{
path.mkdirs();
}
try {
file= File.createTempFile("sound", ".3gp", path);
myAudioRecorder=new MediaRecorder();
myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myAudioRecorder.setOutputFile(file.getAbsolutePath());
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
if( mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)!=null){
Toast.makeText(getBaseContext(), "Yes it is there ", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getBaseContext(), "Sry no accelerometer", Toast.LENGTH_LONG).show();
}
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
mAccel = 0.00f;
mAccelCurrent = SensorManager.GRAVITY_EARTH;
mAccelLast = SensorManager.GRAVITY_EARTH;
record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
myAudioRecorder.prepare();
myAudioRecorder.start();
}
catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
record.setEnabled(false);
stop.setEnabled(true);
Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) throws IllegalArgumentException,SecurityException,IllegalStateException {
try{
myAudioRecorder.stop();
myAudioRecorder.release();
myAudioRecorder = null;
}catch(Exception e){
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), "Audio recorded successfully",Toast.LENGTH_LONG).show();
stop.setEnabled(false);
play.setEnabled(true);
}
});
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) throws IllegalArgumentException,SecurityException,IllegalStateException {
MediaPlayer m = new MediaPlayer();
try {
m.setDataSource(file.getAbsolutePath());
m.prepare();
}
catch (IOException e) {
e.printStackTrace();
}
m.start();
Toast.makeText(getApplicationContext(), "Playing audio", Toast.LENGTH_LONG).show();
}
});
}
private final SensorEventListener mSensorListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
try {
myAudioRecorder.prepare();
myAudioRecorder.start();
record.setEnabled(false);
stop.setEnabled(true);
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(getBaseContext(), "recording has started", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
private final SensorEventListener mSensorIntentListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
if (mAccel > 12) {
Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG).show();
Intent intent = new Intent(getApplicationContext(), MainActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
};
@Override
protected void onPause() {
mSensorManager.unregisterListener(mSensorListener);
super.onPause();
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public class ShakeRec extends Service{
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
return super.onStartCommand(intent, flags, startId);
}
}
public class BootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
mSensorManager = (SensorManager) arg0.getSystemService(arg0.SENSOR_SERVICE);
mSensorManager.registerListener( mSensorIntentListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
}
}
您的 <receiver> 元素将不起作用。如果您要在重新启动时查看 LogCat，您会看到来自 Android 的警告或错误，说它找不到您的 BootReceiver class。清单注册接收器不能是 activity 内的嵌套 class。
删除 <receiver> 元素。去掉 BootReceiver。在 activity 的 onCreate() 中注册您的 SensorEventListener。只要您的进程是 运行（可能不会很长），并且只要设备处于打开状态，您就应该收到传感器事件。
要捕捉震动，您应该使用始终开启的低功耗传感器，并在唤醒锁定的粘性服务中注册。要覆盖大量设备，您的应用应该找到 phone 中可用的低功率传感器。然后使用最佳组合，最大限度地减少电池电量消耗。您还需要确保您的应用已列入电池优化白名单，这样您的应用才能在后台运行。