Question

我是Android Studio中的新手。问题是，当我启动应用程序并按下活动栏中的按钮时，它会崩溃。

这是我的主要活动：

package com.example.tirir_000.iavq;

import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.app.FragmentManager;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener, AdmisionFragment.OnFragmentInteractionListener {
        NavigationView navigationView = null;
        Toolbar toolbar = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @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();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.nav_camera) {
            InicioFragment fragment = new InicioFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        } else if (id == R.id.nav_gallery) {
            AdmisionFragment fragment = new AdmisionFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        } else if (id == R.id.nav_slideshow) {
            CarrerasFragment fragment = new CarrerasFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        } else if (id == R.id.nav_manage) {
            ComunidadFragment fragment = new ComunidadFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        } else if (id == R.id.nav_share) {

        } else if (id == R.id.nav_send) {
            SgaFragment fragment = new SgaFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

    @Override
    public void onFragmentInteraction(Uri uri) {
    }

我的logcat说：

 Process: com.example.tirir_000.iavq, PID: 31097
     java.lang.RuntimeException: com.example.tirir_000.iavq.MainActivity@659c204 must implement OnFragmentInteractionListener
            at com.example.tirir_000.iavq.InicioFragment.onAttach(InicioFragment.java:83)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1231)
            at android.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1085)
            at android.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:976)
            at android.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:95)
            at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2146)
            at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:710)
            at android.os.Handler.handleCallback(Handler.java:815)
            at android.os.Handler.dispatchMessage(Handler.java:104)
            at android.os.Looper.loop(Looper.java:207)
            at android.app.ActivityThread.main(ActivityThread.java:5763)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)

我该如何解决？

Answer 1

嘿，你最后没有使用onFragmentInteraction，但是你没有在Java类中实现onFragmentInteraction

像这样你必须做

公共类xyz扩展了AppcompactActivity的实现onFragmnetInteraction

这样做

通过按活动栏中的按钮崩溃应用程序

1 个答案: