我想让 onSenzorChange 方法运行到线程中。让运行更加流畅。并获取每次变化时x轴的信息。并将其传递给主类(Activity)到 TextView 中。
MainActivity 类:
public class MainActivity extends AppCompatActivity {
TextView textView;
TestOfPassUIThread t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
t = new TestOfPassUIThread(this);
}
public void onStart(View view) {
t.register();
}
}
TestOfPassUIThread 类(不是 Activity 或任何东西)
public class TestOfPassUIThread implements SensorEventListener {
private SensorManager sensorManager;
private Sensor sensor;
public TestOfPassUIThread (Context context) {
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
}
public void register(){
sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);
}
public void unregister() {
sensorManager.unregisterListener(this);
}
// Want this method be in Thread
//How can I do this ?
@Override
public void onSensorChanged(SensorEvent event) {
float xAxis = event.values[0];
// And I want it to display in TextView!
// In main activity would be textView.setText("" + xAxis);
//How to pass it to MainActivity class ?
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
最佳答案
有多种方法可以实现在textview上书写,以下是一种方法。 (您可能想了解回调,请检查 How to implement callbacks in Java )。
至于从后台访问 UI 线程,也有多种方法可以实现(检查: Running code in main thread from another thread )。
对于我们为什么在下面使用HandlerThread
,您可以在这里阅读:Acclerometer Sensor in Separate Thread .
所以你的听众变成:
public abstract class TestOfPassUIThread implements SensorEventListener {
private SensorManager sensorManager;
private Sensor sensor;
private HandlerThread handlerThread;
private Context context;
private Runnable uiRunnable;
private float xAxis;
public TestOfPassUIThread (Context context) {
this.context = context;
sensorManager = (SensorManager) context.getSystemService (Context.SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor (Sensor.TYPE_ACCELEROMETER);
}
public void register () {
initUiRunnable ();
handlerThread = new HandlerThread ("sensorHandler");
handlerThread.start ();
sensorManager.registerListener (
this,
sensor,
SensorManager.SENSOR_DELAY_NORMAL,
new Handler (handlerThread.getLooper ())
);
}
public void unregister () {
sensorManager.unregisterListener (this);
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
handlerThread.quitSafely ();
return;
}
handlerThread.quit ();
} finally {
uiRunnable = null;
}
}
@Override
public void onSensorChanged (SensorEvent event) {
xAxis = event.values [0];
// your other background operations
((Activity)context).runOnUiThread (uiRunnable);
// your other background operations
}
@Override
public void onAccuracyChanged (Sensor sensor, int accuracy) {
}
private void initUiRunnable () {
uiRunnable = new Runnable () {
@Override
public void run () {
// ...... your other UI operations
fillTextView (xAxis);
// ...... your other UI operations
}
};
}
public abstract void fillTextView (float xAxis);
}
您的 Activity :
public class MainActivity extends AppCompatActivity {
private TextView textView;
private TestOfPassUIThread t;
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main);
textView = (TextView)findViewById (R.id.textView);
t = new TestOfPassUIThread (this) {
@Override
public void fillTextView (float xAxis) {
textView.setText ("Current xAxis: " + xAxis);
}
};
}
@Override
protected void onResume () {
super.onResume ();
t.register ();
}
@Override
protected void onPause () {
t.unregister ();
super.onPause ();
}
}
此外,当您重写 Activity 的 LifeCycle 方法(例如 onStart
、onResume
等)时,请确保调用 super.lifeCycleMethod
.
关于java - 线程类并将信息传递到主 Activity 类到 TextView 中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41921306/