AndroidStudio - 在碎片

我想通過以下tutorial..below實現片段錯誤是我的代碼..AndroidStudio - 在碎片

主要活動

package example.org.myfragment; 

import android.os.Bundle; 
import android.os.PersistableBundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBar; 
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; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

import java.util.ArrayList; 

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{ 

    private ActionBarDrawerToggle actionBarDrawerToggle; 
    private DrawerLayout drawerLayout; 
    private ListView navList; 
    private FragmentTransaction fragmentTransaction; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); 
     navList = (ListView) findViewById(R.id.navList); 
     ArrayList<String> navArray = new ArrayList<String>(); 

     navArray.add("Notifications"); 
     navArray.add("My Profile"); 
     navArray.add("Home"); 
     navArray.add("Friends"); 
     navArray.add("Messages"); 
     navArray.add("Chat"); 
     navArray.add("Settings"); 
     navArray.add("Search"); 

     navList.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 

     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_activated_1,navArray); 
     navList.setAdapter(adapter); 
     navList.setOnItemClickListener(this); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,R.string.opendrawer,R.string.closedrawer); 
     drawerLayout.setDrawerListener(actionBarDrawerToggle); 

     ActionBar actionBar = getSupportActionBar(); 
     actionBar.setDisplayShowHomeEnabled(true); 
     actionBar.setDisplayHomeAsUpEnabled(true); 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
     fragmentTransaction = fragmentManager.beginTransaction(); 

     loadSelection(0); 


     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(); 
      } 
     }); 
    } 

    private void loadSelection(int i){ 
     navList.setItemChecked(i, true); 

     switch (i){ 
      case 0: 
       Notifications notifications = new Notifications(); 
       fragmentTransaction.replace(R.id.fragmentHolder,notifications); 
       fragmentTransaction.commit(); 
       break; 
      case 1: 
       MyProfile myProfile = new MyProfile(); 
       fragmentTransaction.replace(R.id.fragmentHolder,myProfile); 
       fragmentTransaction.commit(); 
       break; 
      case 2: 
       Home home = new Home(); 
       fragmentTransaction.replace(R.id.fragmentHolder,home); 
       fragmentTransaction.commit(); 
       break; 
      case 3: 
       Friends friends = new Friends(); 
       fragmentTransaction.replace(R.id.fragmentHolder,friends); 
       fragmentTransaction.commit(); 
       break; 
      case 4: 
       Messages messages = new Messages(); 
       fragmentTransaction.replace(R.id.fragmentHolder,messages); 
       fragmentTransaction.commit(); 
       break; 
      case 5: 

       break; 
      case 6: 

       break; 
      case 7: 

       break; 
     } 

    } 

    @Override 
    public void onPostCreate(Bundle savedInstanceState, PersistableBundle persistentState) { 
     super.onPostCreate(savedInstanceState, persistentState); 
     actionBarDrawerToggle.syncState(); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.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; 
     }else if (id==android.R.id.home){ 
      if(drawerLayout.isDrawerOpen(navList)){ 
       drawerLayout.closeDrawer(navList); 
      }else{ 
       drawerLayout.openDrawer(navList); 
      } 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     loadSelection(position); 

     drawerLayout.closeDrawer(navList); 
    } 
}

activity_main.xml中

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/drawerLayout"> 

    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/fragmentHolder"> 

    </FrameLayout> 

    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:background="#dedede" 
     android:layout_gravity="start" 
     android:id="@+id/navList"> 
    </ListView> 

</android.support.v4.widget.DrawerLayout>

fragment_notifications.xml

<FrameLayout 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" 
    tools:context="example.org.myfragment.Notifications"> 

    <!-- TODO: Update blank fragment layout --> 
    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:text="@string/Notifications" 
     android:gravity="center|top"/> 


</FrameLayout>

的strings.xml

<resources> 
    <string name="app_name">MyFragment</string> 
    <string name="action_settings">Settings</string> 
    <string name="opendrawer">Open</string> 
    <string name="closedrawer">Close</string> 

    <!-- TODO: Remove or change this placeholder text --> 
    <string name="Notifications">Notifications</string> 

    <!-- TODO: Remove or change this placeholder text --> 
    <string name="MyProfile">MyProfile</string> 

    <!-- TODO: Remove or change this placeholder text --> 
    <string name="Home">Home</string> 

    <!-- TODO: Remove or change this placeholder text --> 
    <string name="Friends">Friends</string> 

    <!-- TODO: Remove or change this placeholder text --> 
    <string name="Messages">Messages</string> 

</resources>

logcat的：

12-19 00:33:20.054 2625-2625/? I/art: Not late-enabling -Xcheck:jni (already on) 
12-19 00:33:20.054 2625-2625/? I/art: Late-enabling JIT 
12-19 00:33:20.058 2625-2625/? I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000 
12-19 00:33:20.151 2625-2625/example.org.myfragment W/System: ClassLoader referenced unknown path: /data/app/example.org.myfragment-2/lib/x86 
12-19 00:33:20.362 2625-2651/example.org.myfragment D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 
12-19 00:33:20.443 2625-2651/example.org.myfragment I/OpenGLRenderer: Initialized EGL, version 1.4 
12-19 00:33:20.487 2625-2651/example.org.myfragment W/EGL_emulation: eglSurfaceAttrib not implemented 
12-19 00:33:20.487 2625-2651/example.org.myfragment W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xabf3bda0, error=EGL_SUCCESS 
12-19 00:33:21.221 2625-2625/example.org.myfragment I/Choreographer: Skipped 42 frames! The application may be doing too much work on its main thread. 
12-19 00:33:33.712 2625-2625/example.org.myfragment D/AndroidRuntime: Shutting down VM 
12-19 00:33:33.712 2625-2625/example.org.myfragment E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: example.org.myfragment, PID: 2625 
                     java.lang.IllegalStateException: commit already called 
                      at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:621) 
                      at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:613) 
                      at example.org.myfragment.MainActivity.loadSelection(MainActivity.java:89) 
                      at example.org.myfragment.MainActivity.onItemClick(MainActivity.java:155) 
                      at android.widget.AdapterView.performItemClick(AdapterView.java:310) 
                      at android.widget.AbsListView.performItemClick(AbsListView.java:1145) 
                      at android.widget.AbsListView$PerformClick.run(AbsListView.java:3042) 
                      at android.widget.AbsListView$3.run(AbsListView.java:3879) 
                      at android.os.Handler.handleCallback(Handler.java:739) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:148) 
                      at android.app.ActivityThread.main(ActivityThread.java:5417) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
12-19 00:33:36.026 2625-2625/? I/Process: Sending signal. PID: 2625 SIG: 9

應用程序崩潰，當我點擊任何一個片段.. 而第一片段「通知」沒有按」 t顯示出來..

來源

2015-12-19 Spider

發表您的logcat @Spider – curiousMind

我們必須找到你的錯誤在你的代碼？ – Androider

問題更新.. @ Android @Androider – Spider

嘗試做一些這樣的：

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{ 

private ActionBarDrawerToggle actionBarDrawerToggle; 
private DrawerLayout drawerLayout; 
private ListView navList; 
private FragmentTransaction fragmentTransaction; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); 
    navList = (ListView) findViewById(R.id.navList); 
    ArrayList<String> navArray = new ArrayList<String>(); 

    navArray.add("Notifications"); 
    navArray.add("My Profile"); 
    navArray.add("Home"); 
    navArray.add("Friends"); 
    navArray.add("Messages"); 
    navArray.add("Chat"); 
    navArray.add("Settings"); 
    navArray.add("Search"); 

    navList.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_activated_1,navArray); 
    navList.setAdapter(adapter); 
    navList.setOnItemClickListener(this); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,R.string.opendrawer,R.string.closedrawer); 
    drawerLayout.setDrawerListener(actionBarDrawerToggle); 

    ActionBar actionBar = getSupportActionBar(); 
    actionBar.setDisplayShowHomeEnabled(true); 
    actionBar.setDisplayHomeAsUpEnabled(true); 
    FragmentManager fragmentManager = getSupportFragmentManager(); 
    fragmentTransaction = fragmentManager.beginTransaction(); 

    // loadSelection(0); 


    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(); 
     } 
    }); 
} 

private void loadSelection(int i){ 
    navList.setItemChecked(i, true); 

    switch (i){ 
     case 0: 
      Notifications notifications = new Notifications(); 
      fragmentTransaction.replace(R.id.fragmentHolder,notifications).commit(); 

      break; 
     case 1: 
      MyProfile myProfile = new MyProfile(); 
      fragmentTransaction.replace(R.id.fragmentHolder,myProfile).commit(); 

      break; 
     case 2: 
      Home home = new Home(); 
      fragmentTransaction.replace(R.id.fragmentHolder,home).commit(); 

      break; 
     case 3: 
      Friends friends = new Friends(); 
      fragmentTransaction.replace(R.id.fragmentHolder,friends).commit(); 

      break; 
     case 4: 
      Messages messages = new Messages(); 
      fragmentTransaction.replace(R.id.fragmentHolder,messages).commit(); 

      break; 
     case 5: 

      break; 
     case 6: 

      break; 
     case 7: 

      break; 
    } 

} 

@Override 
public void onPostCreate(Bundle savedInstanceState, PersistableBundle persistentState) { 
    super.onPostCreate(savedInstanceState, persistentState); 
    actionBarDrawerToggle.syncState(); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.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; 
    }else if (id==android.R.id.home){ 
     if(drawerLayout.isDrawerOpen(navList)){ 
      drawerLayout.closeDrawer(navList); 
     }else{ 
      drawerLayout.openDrawer(navList); 
     } 
    } 

    return super.onOptionsItemSelected(item); 
} 

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
    loadSelection(position); 

    drawerLayout.closeDrawer(navList); 
}

}

來源

2015-12-19 05:40:53 curiousMind

它不工作..同名錯誤.. – Spider

@Spider我改變了代碼。現在它會完美的工作:) – curiousMind

謝謝Android ..它的工作.. – Spider

不要全局聲明FragmentTransaction對象。每次點擊列表項時，都必須創建FragmentTransaction的新對象。

因此，在切換大小寫後，在loadSelection方法中定義FragmentTransaction。

private void loadSelection(int i){ 
     Fragment fragment; 

     switch (i){ 
      case 0: 
       fragment = new Notifications(); 
       break; 
      case 1: 
       fragment = new MyProfile(); 
       break; 
      ...... 
     } 

     if(fragment != null) { 
      FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
      ft.replace(R.id.fragmentHolder , fragment); 
      ft.commit(); 
     } 
}

來源

2015-12-19 05:59:39

你需要採取新FragmentTransaction每次改變片段

private void loadSelection(int i){ 
     navList.setItemChecked(i, true); 

     switch (i){ 
      case 0: 

       Notifications notifications = new Notifications(); 
       getSupportFragmentManager().beginTransaction().replace(R.id.fragmentHolder,notifications).commit(); 

       break; 
      case 1: 

       MyProfile myProfile = new MyProfile(); 
       getSupportFragmentManager().beginTransaction().replace(R.id.fragmentHolder,myProfile).commit(); 

       break; 
      case 2: 

       Home home = new Home(); 
       getSupportFragmentManager().beginTransaction().replace(R.id.fragmentHolder,home).commit(); 

       break; 
      case 3: 

       Friends friends = new Friends(); 
       getSupportFragmentManager().beginTransaction().replace(R.id.fragmentHolder,friends).commit(); 

       break; 
      case 4: 
       Messages messages = new Messages(); 
       getSupportFragmentManager().beginTransaction().replace(R.id.fragmentHolder,messages).commit(); 

       break; 
      case 5: 

       break; 
      case 6: 

       break; 
      case 7: 

       break; 
     } 

    }

來源

2015-12-19 06:14:18 user1140237

AndroidStudio - 在碎片

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