我有一个包含许多片段的应用程序,当单击一个按钮时,我正试图从一个片段转到另一个片段。
我遇到的麻烦是startActivity(new Intent(HomeFragment.this, FindPeopleFragment.class));

package info.androidhive.slidingmenu;

import info.androidhive.slidingmenu.HomeFragment;
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.Toast;

public class HomeFragment extends Fragment {

public HomeFragment() {
}

ImageButton bSearchByLocation, bSearchByNumber;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    super.onCreateView(inflater, container, savedInstanceState);
    View InputFragmentView = inflater.inflate(R.layout.fragment_home,
            container, false);

    bSearchByNumber = ((ImageButton) InputFragmentView
            .findViewById(R.id.bSearchByLocation));
    bSearchByLocation = ((ImageButton) InputFragmentView
            .findViewById(R.id.bSearchByNumber));

    bSearchByLocation.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.bSearchByNumber) {
                Toast.makeText(getActivity(), "1", Toast.LENGTH_SHORT)
                        .show();
                 startActivity(new Intent(HomeFragment.this, FindPeopleFragment.class));
            }
        }
    });
    bSearchByNumber.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.bSearchByLocation) {
                Toast.makeText(getActivity(), "2", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    });
    return InputFragmentView;
}
}

在我完成解决方案后,代码如下所示:
package info.androidhive.slidingmenu;

import info.androidhive.slidingmenu.HomeFragment;
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

public class HomeFragment extends Fragment {

public HomeFragment() {
}

ImageButton bSearchByLocation, bSearchByNumber;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    super.onCreateView(inflater, container, savedInstanceState);
    View InputFragmentView = inflater.inflate(R.layout.fragment_home,
            container, false);

    bSearchByNumber = ((ImageButton) InputFragmentView
            .findViewById(R.id.bSearchByLocation));
    bSearchByLocation = ((ImageButton) InputFragmentView
            .findViewById(R.id.bSearchByNumber));

    bSearchByLocation.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.bSearchByNumber) {
                Toast.makeText(getActivity(), "1", Toast.LENGTH_SHORT)
                        .show();
                startActivity(new Intent(getActivity(), FindPeopleFragment.class));
            }
        }
    });
    bSearchByNumber.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.bSearchByLocation) {
                Toast.makeText(getActivity(), "2", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    });
    return InputFragmentView;
}
}

但当我运行它时,应用程序崩溃并关闭。
这是我的AndroidManifest代码:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="info.androidhive.slidingmenu"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
    android:name="info.androidhive.slidingmenu.MainActivity"
    android:label="@string/app_name" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
<activity android:name="info.androidhive.slidingmenu.FindPeopleFragment"></activity>
</application>

</manifest>

这是我的日志聊天:
顺便说一句。。。。我使用了这个surce代码并在上面工作:
http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer

最佳答案

Fragment中,您应该将宿主活动(上下文)获取为getActivity()。请改为:

startActivity(new Intent(getActivity(), FindPeopleFragment.class));

在清单中声明FindPeopleFragment类:
<activity
    android:name="com.packagename.FindPeopleFragment" />

必须在清单文件中声明所有Activities(不是Fragment)。
另外,检查FindPeopleFragment是否扩展ActivityFragmentActivity。如果这扩展了Fragment,请不要执行Intent。您必须创建一个FragmentTransaction来替换(或添加上面的)旧片段(HomeFragment)。
更新
你实现这一目标的方法是错误的。您尝试启动一个新的Activity,在您的例子中,它是一个Fragment,而不是一个活动(扩展片段)。为此,您可以:
// call a method when click event
((MyFragmentActivity) getActivity()).replaceFragments();

然后,在FragmentActivity中,将方法设置为:
// replace the fragment container with this method
public void replaceFragments() {
    Fragment newFragment = new FindPeopleFragment();
    FragmentTransaction transaction = getFragmentManager().beginTransaction();
    transaction.replace(R.id.fragment_container, newFragment);
    transaction.commit();
}

更新2
正如@squonk在评论和his answer中所说,我的上述回答是一个解决方案,但不是正确的。要获得真正正确的解决方案,您需要声明一个Callback interface并将Fragment与任何Activity关联起来。
首先声明一个接口并将其附加到片段中的活动:
OnFragSelected mCallback;

public interface OnFragSelected {
    public void OnFragSelected(int id);
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mCallback = (OnFragSelected) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()+" must implement OnFragSelected interface..");
    }
}

然后在单击事件中调用此项:
@Override
public void onClick(View v) {
    mCallback.OnFragSelected(800);
}

最后,在片段活动中:
... implements HomeFragment.OnFragSelected {

    Fragment newFragment;

    @Override
    public void OnFragSelected(int id) {
        // example: id = 800
        // ...
        newFragment = new FindPeopleFragment();
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.replace(R.id.fragment_container, newFragment);
        transaction.commit();
    }

}

这样“更加灵活[…]多个活动现在可以嵌入您的片段,它们只需实现通信接口”。这很重要,因为“片段是可重用的,因此不依赖于特定的活动”。另外,如果您“在其他地方使用片段,则可以消除RuntimeException的风险,因为它是强类型的。”
这个问题和这些关于Fragment 2 fragment communicating的答案可以告诉你区别。Here,你有谷歌的例子,这个答案:onAttach callback from fragment to activity也许你能想出来。

10-08 17:32