在活动中调用片段方法？
我试图从一个活动调用一个片段方法，但它会导致一个OutOfMemoryError。我正在学习本教程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)
渲染片段xml中的问题：
这是我的片段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>
这是我的片段代码：
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);
}
}
这是主要活动中导致空指针异常的代码。当我尝试将片段转换为Current_forecast_fragment：
时会发生这种情况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);
}
有什么建议吗？
1 个答案:
答案 0 :(得分：1)
您已将片段布局放置在片段current_forefast_fragment.xml中。这导致了Current_forecast_fragment和OutOfMemoryError的循环影响。因此，请从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"/>
为了获得片段引用，您需要修改您想要保留MainActivity的{{1}}和其他片段类。我假设您有两个片段Current_forecast_fragment和Tab1.java。在第一个中，我们需要使用适当的方法定义Current_forecast_fragment.java接口：
Callback该工具在课程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;
}
}
中提及Callback之后：
MainActivity现在，您可以通过调用接口方法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;
}
}
从Current_forecast_fragment访问Tab1.java实例。
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