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in the below code, i have a mainActivity that hosts two fragments Frag1 and Frag2 as shown below, Frag1 implements sensorEventListener and when the button in the Frag1 is clicked the sensor reading should pass to Frag2.
to do so, I created an interface onSendListener which is in onAttch is set to sendValues = (onSendListener) activity;. and the mainActivity implements onSendListener as shown in the code of the mainActivity posted below, and in onSendListener i pass the readings to Frag2.
at run time i receive the below posted logCat errors.
please let me know what i am missing ro doing wrong.
** MainActivity**:
public class MainActivity extends Activity implements onSendListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
}
/**
* to send values from frag1 to frag2 through mainActivity. use bundle.
*/
@Override
public void onSendValues(float x, float y, float z) {
// TODO Auto-generated method stub
Bundle b = new Bundle();
b.putFloat("x", x);
b.putFloat("y", y);
b.putFloat("z", z);
Frag2 frag2 = new Frag2();
frag2.setArguments(b);
}
}
**Frag1 **:
public class Frag1 extends Fragment implements SensorEventListener {
private SensorManager sensorManager;
TextView tvAccX;
TextView tvAccY;
TextView tvAccZ;
private float x = 0.0f;
private float y = 0.0f;
private float z = 0.0f;
private void setAccX(float x) {
this.x = x;
}
private float getAccX() {
return this.x;
}
private void setAccY(float y) {
this.y = y;
}
private float getAccY() {
return this.y;
}
private void setAccZ(float z) {
this.z = z;
}
private float getAccZ() {
return this.z;
}
Button btnSend;
onSendListener sendValues;
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
sendValues = (onSendListener) activity;
sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.frag_1, container, false);
tvAccX = (TextView) view.findViewById(R.id.tv_accX_value);
tvAccY = (TextView) view.findViewById(R.id.tv_accY_value);
tvAccZ = (TextView) view.findViewById(R.id.tv_accZ_value);
btnSend = (Button) view.findViewById(R.id.btn_send);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
showAccReadings(event);
break;
default:
break;
}
}
private void showAccReadings(SensorEvent event) {
// TODO Auto-generated method stub
float[] values = event.values;
float x = values[0];
float y = values[1];
float z = values[2];
setAccX(x);
setAccY(y);
setAccZ(z);
tvAccX.setText(String.valueOf(x));
tvAccY.setText(String.valueOf(y));
tvAccZ.setText(String.valueOf(z));
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
Sensor accSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(this, accSensor, sensorManager.SENSOR_DELAY_FASTEST);
btnSend.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
sendValues.onSendValues(getAccX(), getAccY(), getAccZ());
}
});
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
sensorManager.unregisterListener(this);
}
}
**Frag2 **:
public class Frag2 extends Fragment {
float x;
float y;
float z;
TextView tvX;
TextView tvY;
TextView tvZ;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
x = getArguments().getFloat("x");
y = getArguments().getFloat("y");
z = getArguments().getFloat("z");
View view = inflater.inflate(R.layout.frag_2, container, false);
tvX = (TextView) view.findViewById(R.id.tv_accX2_label);
tvY = (TextView) view.findViewById(R.id.tv_accY2_label);
tvZ = (TextView) view.findViewById(R.id.tv_accZ2_label);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onViewCreated(view, savedInstanceState);
tvX.setText(String.valueOf(x));
tvY.setText(String.valueOf(y));
tvZ.setText(String.valueOf(z));
}
}
** mainActivity.xml**:
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}">
<fragment
android:name="com.example.fragmentcommunication_00.Frag1"
android:id="@+id/frag_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"/>
<fragment
android:name="com.example.fragmentcommunication_00.Frag2"
android:id="@+id/frag_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:layout_centerHorizontal="true"
android:layout_below="@id/frag_1"/>
** Frag1.xml**:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://ift.tt/nIICcg"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tv_accX_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:text="Acc[X]: "/>
<TextView
android:id="@+id/tv_accX_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/tv_accX_label"
android:gravity="center_vertical|center_horizontal"/>
<TextView
android:id="@+id/tv_accY_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@id/tv_accX_label"
android:text="Acc[Y]: "/>
<TextView
android:id="@+id/tv_accY_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="@id/tv_accY_label"
android:layout_below="@id/tv_accX_label"
android:gravity="center_vertical|center_horizontal"/>
<TextView
android:id="@+id/tv_accZ_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@id/tv_accY_label"
android:text="Acc[Z]: "/>
<TextView
android:id="@+id/tv_accZ_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="@id/tv_accZ_label"
android:layout_below="@id/tv_accY_label"
android:gravity="center_vertical|center_horizontal"/>
<Button
android:id="@+id/btn_send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tv_accZ_label"
android:gravity="center_vertical|center_horizontal"
android:text="send to frag_2"/>
**Frag2.xml **:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://ift.tt/nIICcg"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tv_accX2_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:text="Acc[X]: "/>
<TextView
android:id="@+id/tv_accY2_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@+id/tv_accX2_label"
android:text="Acc[Y]: "/>
<TextView
android:id="@+id/tv_accZ2_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@+id/tv_accY2_label"
android:text="Acc[Z]: "/>
logCat:
01-26 10:51:24.416: E/AndroidRuntime(4546): FATAL EXCEPTION: main
01-26 10:51:24.416: E/AndroidRuntime(4546): Process: com.example.fragmentcommunication_00, PID: 4546
01-26 10:51:24.416: E/AndroidRuntime(4546): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentcommunication_00/com.example.fragmentcommunication_00.MainActivity}: android.view.InflateException: Binary XML file line #14: Error inflating class fragment
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2282)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2340)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread.access$800(ActivityThread.java:157)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.os.Handler.dispatchMessage(Handler.java:102)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.os.Looper.loop(Looper.java:157)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread.main(ActivityThread.java:5293)
01-26 10:51:24.416: E/AndroidRuntime(4546): at java.lang.reflect.Method.invokeNative(Native Method)
01-26 10:51:24.416: E/AndroidRuntime(4546): at java.lang.reflect.Method.invoke(Method.java:515)
01-26 10:51:24.416: E/AndroidRuntime(4546): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
01-26 10:51:24.416: E/AndroidRuntime(4546): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
01-26 10:51:24.416: E/AndroidRuntime(4546): at dalvik.system.NativeStart.main(Native Method)
01-26 10:51:24.416: E/AndroidRuntime(4546): Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class fragment
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
01-26 10:51:24.416: E/AndroidRuntime(4546): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:340)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.Activity.setContentView(Activity.java:1973)
01-26 10:51:24.416: E/AndroidRuntime(4546): at com.example.fragmentcommunication_00.MainActivity.onCreate(MainActivity.java:17)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.Activity.performCreate(Activity.java:5389)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2246)
01-26 10:51:24.416: E/AndroidRuntime(4546): ... 11 more
01-26 10:51:24.416: E/AndroidRuntime(4546): Caused by: java.lang.NullPointerException
01-26 10:51:24.416: E/AndroidRuntime(4546): at com.example.fragmentcommunication_00.Frag2.onCreateView(Frag2.java:25)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.Fragment.performCreateView(Fragment.java:1700)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:866)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1142)
0 1-26 10:51:24.416: E/AndroidRuntime(4546): at android.app.Activity.onCreateView(Activity.java:4935)
01-26 10:51:24.416: E/AndroidRuntime(4546): at android.view.LayoutInflater.createViewFromTag(LayoutI nflater.java:695)
asked 25 secs ago
error when pass data between fragments through the mainActivity
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