Вызвать метод фрагмента в активности?

Question

Я пытаюсь вызвать метод фрагмента из активности, но он вызывает OutOfMemoryError. Я следовал этот учебник Link

Error reporting crash 
                    java.lang.OutOfMemoryError: Failed to allocate a 6289456 byte allocation with 4315368 free bytes and 4MB until OOM 
                     at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:95) 
                     at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:125) 
                     at java.lang.StringBuffer.append(StringBuffer.java:278) 
                     at java.io.StringWriter.write(StringWriter.java:123) 
                     at com.android.internal.util.FastPrintWriter.flushLocked(FastPrintWriter.java:358) 
                     at com.android.internal.util.FastPrintWriter.appendLocked(FastPrintWriter.java:303) 
                     at com.android.internal.util.FastPrintWriter.write(FastPrintWriter.java:625) 
                     at com.android.internal.util.FastPrintWriter.append(FastPrintWriter.java:658) 
                     at java.io.PrintWriter.append(PrintWriter.java:691) 
                     at java.io.PrintWriter.append(PrintWriter.java:687) 
                     at java.io.Writer.append(Writer.java:198) 
                     at java.lang.Throwable.printStackTrace(Throwable.java:324) 
                     at java.lang.Throwable.printStackTrace(Throwable.java:300) 
                     at android.util.Log.getStackTraceString(Log.java:343) 
                     at com.android.internal.os.RuntimeInit.Clog_e(RuntimeInit.java:61) 
                     at com.android.internal.os.RuntimeInit.-wrap0(RuntimeInit.java) 
                     at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:86) 
                     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693) 
                     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690) 

Рендер проблемы в фрагмент XML:

Это мой фрагмент XML: [current_forefast_fragment]

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:background="@drawable/bg_gradient"> 

<fragment 
    android:id="@+id/current_fragment" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:name="koemdzhiev.com.stormy.Current_forecast_fragment"/> 

<ImageView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/iconImageView" 
    android:src="@mipmap/clear_night" 
    android:adjustViewBounds="true" 
    android:scaleType="fitXY" 
    android:contentDescription="@string/weatherIconDesc" 
    android:layout_above="@+id/locationLabel" 
    android:layout_marginBottom="20dp" 
    android:layout_centerHorizontal="true"/> 
<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="requesting current location..." 
    android:id="@+id/locationLabel" 
    android:textColor="@android:color/white" 
    android:textSize="22sp" 
    android:layout_above="@+id/timeLabel" 
    android:layout_centerHorizontal="true" 
    android:layout_marginBottom="51dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="--" 
    android:id="@+id/temperatureLabel" 
    android:layout_centerVertical="true" 
    android:layout_centerHorizontal="true" 
    android:textColor="@android:color/white" 
    android:textSize="125sp"/> 

<ImageView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/degreeImageView" 
    android:layout_alignTop="@+id/temperatureLabel" 
    android:layout_toRightOf="@+id/temperatureLabel" 
    android:layout_toEndOf="@+id/temperatureLabel" 
    android:src="@mipmap/degree" 
    android:layout_marginTop="27dp" 
    android:layout_marginLeft="10dp"/> 

</RelativeLayout> 

Это мой фрагмент кода :

public class Current_forecast_fragment extends Fragment { 
private MainActivity mActivity; 
@InjectView(R.id.timeLabel) 
TextView mTimeLabel; 
@InjectView(R.id.temperatureLabel) 
TextView mTemperatureLabel; 
@InjectView(R.id.humidityValue) 
TextView mHumidityValue; 
@InjectView(R.id.precipValue) 
TextView mPrecipValue; 
@InjectView(R.id.summaryLabel) 
TextView mSummaryLabel; 
@InjectView(R.id.locationLabel) 
TextView mLocationLabel; 
@InjectView(R.id.windSpeedValue) 
TextView mWindSpeedValue; 
@InjectView(R.id.iconImageView) 
ImageView mIconImageView; 
@InjectView(R.id.refreshImageView) 
ImageView mRefreshImaveView; 
@InjectView(R.id.progressBar) 
ProgressBar mProgressBar; 
@InjectView(R.id.degreeImageView) 
ImageView mDegreeImageView; 

@Override 
public void onCreate(@Nullable Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    mActivity = ((MainActivity) getActivity()); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    View v = inflater.inflate(R.layout.current_forefast_fragment, container, false); 
    ButterKnife.inject(this, v); 


    return v; 
} 


public void toggleRefresh() { 
    if (mProgressBar.getVisibility() == View.INVISIBLE) { 
     mProgressBar.setVisibility(View.VISIBLE); 
     mRefreshImaveView.setVisibility(View.INVISIBLE); 
    } else { 
     mProgressBar.setVisibility(View.INVISIBLE); 
     mRefreshImaveView.setVisibility(View.VISIBLE); 
    } 

    // updates the dysplay with the data in the CUrrentWeather locaal object 

} 

public void updateDisplay() { 
    Current current = mActivity.mForecast.getCurrent(); 
    //setting the current weather details to the ui 
    mTemperatureLabel.setText(current.getTemperature() + ""); 
    mTimeLabel.setText("At " + current.getFormattedTime() + " it will be"); 
    mHumidityValue.setText(current.getHumidity() + "%"); 
    mPrecipValue.setText(current.getPrecipChange() + "%"); 
    mSummaryLabel.setText(current.getSummery()); 
    mWindSpeedValue.setText(current.getWindSpeed() + ""); 
    mLocationLabel.setText(current.getTimeZone()); 
    mActivity.getLocationName(); 
    Drawable drawable = ContextCompat.getDrawable(mActivity, current.getIconId()); 
    mIconImageView.setImageDrawable(drawable); 

} 

} 

И это код в основном действии, который вызывает исключение нулевого указателя. Это происходит, когда я пытаюсь передать фрагмент в Current_forecast_fragment:

public class MainActivity extends AppCompatActivity { 
ViewPager pager; 
ViewPagerAdapter adapter; 
SlidingTabLayout tabs; 
CharSequence Titles[]={"Current","Hourly","Daily"}; 
int Numboftabs =3; 
Current_forecast_fragment mCurrent_forecast_fragment; 

public static final String TAG = MainActivity.class.getSimpleName(); 
public static final String LOCATION_KEY = "location_key"; 
public Forecast mForecast; 
public static final String DAILY_FORECAST = "DAILY_FORECAST"; 
public static final String HOURLY_FORECAST = "HOURLY_FORECAST"; 
//default coordinates - Gotse Delchev, UK Lati:57.156866 ; Long: 
private double latitude = 41.5667; 
private double longitude = 23.7333; 
private LocationManager locationManager; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    //-----------MY CODE STARTS HERE----------------- 

    mCurrent_forecast_fragment = (Current_forecast_fragment) getSupportFragmentManager().findFragmentById(R.id.current_fragment); 
    //Log.d("MainActivity",mCurrent_forecast_fragment.getTag() + "Georgi"); 
    getLocation(); 

    // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs. 
    adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs); 

    // Assigning ViewPager View and setting the adapter 
    pager = (ViewPager) findViewById(R.id.pager); 
    pager.setAdapter(adapter); 

    // Assiging the Sliding Tab Layout View 
    tabs = (SlidingTabLayout) findViewById(R.id.tabs); 
    tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width 

    // Setting Custom Color for the Scroll bar indicator of the Tab View 
    tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() { 
     @Override 
     public int getIndicatorColor(int position) { 
      return getResources().getColor(R.color.tabsScrollColor); 
     } 
    }); 

    // Setting the ViewPager For the SlidingTabsLayout 
    tabs.setViewPager(pager); 




} 

Любые предложения?

Answer 1

Вы разместили фрагмент фрагмента внутри фрагмента current_forefast_fragment.xml. Это вызвало воздействие петли в ваших Current_forecast_fragment и OutOfMemoryError. Так, удалите эту строку из current_forefast_fragment.xml:

<fragment 
    android:id="@+id/current_fragment" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:name="koemdzhiev.com.stormy.Current_forecast_fragment"/> 

Для того, чтобы получить ссылку на фрагмент вам нужно будет изменить ваши MainActivity и другие фрагментарные классы, где вы хотите сохранить Current_forecast_fragment. Я предполагаю, что у вас есть два фрагмента Tab1.java и Current_forecast_fragment.java. В первом мы должны определить Callback интерфейс с правильным методом:

import android.app.Activity; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 

/** 
* Created by hp1 on 21-01-2015. 
*/ 
public class Tab1 extends Fragment { 

    private Callback callback; 

    public interface Callback{ 
     Current_forecast_fragment getCurrentForecastFragment(); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     View v =inflater.inflate(R.layout.tab_1,container,false); 

     Button btn1 = (Button) v.findViewById(R.id.btn1); 
     btn1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       callback.getCurrentForecastFragment(); 
      } 
     }); 
     return v; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     callback = (Callback) activity; 
    } 
} 

После того, реализующие упомянутый Callback в классе MainActivity:

public class MainActivity extends AppCompatActivity implements Tab1.Callback { 
    ViewPager pager; 
    ViewPagerAdapter adapter; 
    SlidingTabLayout tabs; 
    CharSequence Titles[] = {"Current", "Hourly", "Daily"}; 
    int Numboftabs = 3; 
    Current_forecast_fragment mCurrent_forecast_fragment; 

    public static final String TAG = MainActivity.class.getSimpleName(); 
    public static final String LOCATION_KEY = "location_key"; 
    public static final String DAILY_FORECAST = "DAILY_FORECAST"; 
    public static final String HOURLY_FORECAST = "HOURLY_FORECAST"; 
    //default coordinates - Gotse Delchev, UK Lati:57.156866 ; Long: 
    private double latitude = 41.5667; 
    private double longitude = 23.7333; 
    private LocationManager locationManager; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     //-----------MY CODE STARTS HERE----------------- 

     //mCurrent_forecast_fragment = (Current_forecast_fragment) getSupportFragmentManager().findFragmentById(R.id.current_fragment); 
     //Log.d("MainActivity",mCurrent_forecast_fragment.getTag() + "Georgi"); 
     //getLocation(); 

     // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs. 
     adapter = new ViewPagerAdapter(getSupportFragmentManager(), Titles, Numboftabs); 

     // Assigning ViewPager View and setting the adapter 
     pager = (ViewPager) findViewById(R.id.pager); 
     pager.setAdapter(adapter); 

     // Assiging the Sliding Tab Layout View 
     tabs = (SlidingTabLayout) findViewById(R.id.tabs); 
     tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width 

     // Setting Custom Color for the Scroll bar indicator of the Tab View 
     tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() { 
      @Override 
      public int getIndicatorColor(int position) { 
       return getResources().getColor(R.color.tabsScrollColor); 
      } 
     }); 

     // Setting the ViewPager For the SlidingTabsLayout 
     tabs.setViewPager(pager); 


    } 

    public Current_forecast_fragment getCurrentForecastFragment() { 
     // second argument is position of Current_forecast_fragment in ViewPagerAdapter 
     mCurrent_forecast_fragment = (Current_forecast_fragment) adapter.instantiateItem(pager, 1); 
     return mCurrent_forecast_fragment; 
    } 
} 

Теперь вы можете получить доступ к Current_forecast_fragment экземпляр из Tab1.java путем вызова метода интерфейса callback.getCurrentForecastFragment() ,