Android 无法从Mainacvity转到FragmentOne_Android_Android Fragments_Android Activity

Android 无法从Mainacvity转到FragmentOne

android android-fragments

Android 无法从Mainacvity转到FragmentOne,android,android-fragments,android-activity,Android,Android Fragments,Android Activity,主要活动： package piestudio.opinion; import android.app.FragmentManager; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.NavigationView; import android.support.design.widget.Snack

主要活动：

package piestudio.opinion;

import android.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
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;
import android.view.View;

import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;

    @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);
        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }

    @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) {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        final NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);

        int id = item.getItemId();

        if (id == R.id.toi) {
            FragmentOne FragmentOne = new FragmentOne();
            FragmentManager fragmentManager = getFragmentManager();

            fragmentManager.beginTransaction()
                    .add(R.id.content_frame, FragmentOne, "Times of India")
                    .commit();
            drawer.closeDrawer(navigationView);
        } else if (id == R.id.thehindu) {
        } else if (id == R.id.support) {
        }
        return true;
    }
}

FragmentOne.java：

package piestudio.opinion;

import android.app.Activity;
import android.app.Fragment;

/**
 * Created by jene on 7/4/2016.
 */
public class FragmentOne extends Fragment {
    Activity MainActivity;

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

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

我想用我的应用程序做什么？我的应用程序中有一个导航抽屉，有三个选项：

印度时报

印度教徒

支持

现在，当用户单击导航抽屉中的印度时报时，我想转到

FragmentOne

我的代码有问题吗上面的代码工作正常，但功能不正常-当我单击印度时报时，什么也没发生

如果您想查看导航抽屉以获得更好的想法，请参阅

日志：

07-08 11:56:52.301 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.os.PersistableBundle”。访问$super
07-08 11:56:52.305 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.os.PersistableBundle”。访问$super
07-08 11:56:52.305 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.media.session.MediaController”。访问$super
07-08 11:56:52.305 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity.access$super引用的类“android.widget.Toolbar”
07-08 11:56:52.321 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity.access$super引用的类“android.app.ActivityManager$TaskDescription”
07-08 11:56:52.325 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.app.SharedElementCallback”。访问$super
07-08 11:56:52.325 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.os.PersistableBundle”。访问$super
07-08 11:56:52.325 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.transition.TransitionManager”。访问$super
07-08 11:56:52.329 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.app.SharedElementCallback”。访问$super
07-08 11:56:52.353 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.app.assist.AssistContent”。访问$super
07-08 11:56:52.357 1281-1281/piestudio.opinion E/dalvikvm:找不到从piestudio.opinion.MainActivity.access方法引用的类“android.view.SearchEvent”
07-08 11:56:52.357 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.MainActivity引用的类“android.os.PersistableBundle”。访问$super
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.app.SharedElementCallback”。访问$super
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”
07-08 11:57:01.429 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.app.SharedElementCallback”。访问$super
07-08 11:57:01.449 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”
07-08 11:57:01.453 1281-1281/piestudio.opinion E/dalvikvm:找不到从方法piestudio.opinion.FragmentOne引用的类“android.transition.transition”

主要活动的布局：

<?xml version="1.0" encoding="utf-8"?>
<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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start"
    app:theme="@style/ThemeOverlay.AppCompat">

<include
    layout="@layout/app_bar_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

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

应用程序栏布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true"
    tools:context="piestudio.opinion.MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorDark"

        app:popupTheme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

您忘记了太多的项目文件，您不允许我们了解该问题。我可以推荐的方法是我通常遵循的方法：

抽屉实用性：（主活动）

activity_drawer.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
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"
tools:context=".MainActivity"
android:fitsSystemWindows="false">

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

<android.support.design.widget.NavigationView
    android:id="@+id/navigation"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:elevation="4dp"
    app:menu="@menu/menu"/>
</android.support.v4.widget.DrawerLayout>

我建议不要将对象命名为与类完全相同的名称：

FragmentOne FragmentOne=new FragmentOne（）

@CodeConfident我没有得到它，请解释：）。代码的其余部分还可以吗？我只是建议您以不同于类的方式命名片段对象<代码>FragmentOne FragmentOne=新FragmentOne（）和

.add（R.id.content\u frame，fragmentOne，“印度时报”）

。我建议您也发布活动的布局xml。@CodeConfident已完成查看…以及app_bar_main中包含的布局^（没有错误，但我无法从一个活动移动到碎片。您也没有进行碎片布局的膨胀，我已经用碎片代码更新了答案。当我单击印度时报选项时，您的代码显示了这一点。它显示文本“helloworld！您的碎片处于活动状态”然而，当我点击印度时报选项时，它应该显示“你的片段处于活动状态”，因为hello world是主要活动的文本，而fragment是活动的文本是片段的文本。请访问此链接以获得正确的理解

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
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"
tools:context=".MainActivity"
android:fitsSystemWindows="false">

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

<android.support.design.widget.NavigationView
    android:id="@+id/navigation"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:elevation="4dp"
    app:menu="@menu/menu"/>
</android.support.v4.widget.DrawerLayout>

<menu 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"
tools:context=".MainActivity">


<item
    android:id="@+id/timesOfIndia"
    android:checkable="true"
    android:orderInCategory="100"
    android:title="Times of India"
    app:showAsAction="always"/>



<item
    android:id="@+id/theHindu"
    android:checkable="true"
    android:orderInCategory="100"
    android:title="The Hindu"
    app:showAsAction="always"/>

<item
    android:id="@+id/settings"
    android:checkable="true"
    android:orderInCategory="100"
    android:title="Settings"
    app:showAsAction="always"/>
 </menu>

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


public class YourFragment extends Fragment {


public YourFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_your, container, false);
}

}