单击 Imageview 更改片段答案

【问题标题】：Changing fragment on clicking on Imageview单击 Imageview 更改片段
【发布时间】：2015-01-02 13:38:18
【问题描述】：

我使用 NavigationDrawerFragment 创建了一个项目，并为菜单设置了片段。菜单片段之间的切换正在工作。但现在我在其中一个片段上创建了一个图像视图。我希望当您单击图像视图时，它会像菜单一样更改片段。

MainActivity.java

package com.****.****;

import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity
        implements NavigationDrawerFragment.NavigationDrawerCallbacks {

    /**
     * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
     */
    private NavigationDrawerFragment mNavigationDrawerFragment;

    /**
     * Used to store the last screen title. For use in {@link #restoreActionBar()}.
     */
    private CharSequence mTitle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
        mTitle = getTitle();

        // Set up the drawer.
        mNavigationDrawerFragment.setUp(
                R.id.navigation_drawer,
                (DrawerLayout) findViewById(R.id.drawer_layout));
    }

    @Override
    public void onNavigationDrawerItemSelected(int position) {

        Fragment objFragment = null;

        switch (position) {
            case 0:
                objFragment = new news_Fragment();
                break;
            case 1:
                objFragment = new heroes_Fragment();
                break;
            case 2:
                objFragment = new game_Fragment();
                break;
        }

        // update the main content by replacing fragments
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.container, objFragment)
                .commit();
    }

    public void onSectionAttached(int number) {
        switch (number) {
            case 1:
                mTitle = getString(R.string.title_section1);
                break;
            case 2:
                mTitle = getString(R.string.title_section2);
                break;
            case 3:
                mTitle = getString(R.string.title_section3);
                break;
        }
    }

    public void restoreActionBar() {
        ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setTitle(mTitle);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (!mNavigationDrawerFragment.isDrawerOpen()) {
            // Only show items in the action bar relevant to this screen
            // if the drawer is not showing. Otherwise, let the drawer
            // decide what to show in the action bar.
            getMenuInflater().inflate(R.menu.main, menu);
            restoreActionBar();
            return true;
        }
        return super.onCreateOptionsMenu(menu);
    }

    @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);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }

        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            ((MainActivity) activity).onSectionAttached(
                    getArguments().getInt(ARG_SECTION_NUMBER));
        }
    }

}

heroes_Fragment.java

package com.****.****;

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

/**
 * Created by Calvin on 27/12/2014.
 */
public class heroes_Fragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.trac_layout, container, false);
    }

    public View trac(View view, LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.trac_layout, container, false);


    }
}

heroes_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:background="@drawable/header_bg">

    <TableLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignWithParentIfMissing="false"
        android:id="@+id/tableLayout"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true">

        <TableRow
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/icontrac"
                android:src="@drawable/icon_portrait_trac"
                android:layout_column="0"
                android:layout_marginRight="20dp"
                android:layout_marginLeft="20dp"
                android:clickable="true"
                android:onClick="trac"/>

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/iconreap"
                android:src="@drawable/icon_portrait_reap"
                android:layout_column="1"
                android:layout_marginRight="20dp"
                android:layout_marginLeft="20dp" />

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/iconwid"
                android:src="@drawable/icon_portrait_wid"
                android:layout_column="2"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp" />

        </TableRow>

    </TableLayout>

</RelativeLayout>

trac_Fragment.java

package com.****.****;

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

/**
 * Created by Calvin on 27/12/2014.
 */
public class trac_Fragment extends Fragment {

    }
}

我希望当您单击 imageview (trac) 时它会更改片段。好像我们改变了活动。对不起我的英语。

我尝试使用 trac() 方法，但应用程序崩溃

【问题讨论】：

欢迎来到 Stack Overflow。由于这是您的第一个问题，请阅读stackoverflow.com/help/how-to-ask。请将您的问题添加到预期行为和您使用当前代码获得的行为。此外，一张小图可能有助于解释您的场景。

标签： java android android-fragments imageview fragment

【解决方案1】：

您确实在布局中设置了 android:onClick="trac"，但您从未使用过 trac() 方法。

您应该在适当的类下声明 trac() {...}（您在其中实现该 hero_layout.xml），并在那里解决新活动的调用（使用 Intents）

【讨论】：

我已经试过了。但它不起作用并且应用程序崩溃。而且我不想调用新的活动，而是显示一个新的片段。
方法应该看起来像 public void trac(View v) {...} 你应该替换两个片段，这是一些印度人解释它youtube.com/…
我试过你告诉我的。但我有一个错误。 java.lang.IllegalStateException：在活动类 com.****.***.MainActivity 中找不到方法 trac(View) 用于视图类 android.widget.ImageView 上的 onClick 处理程序，ID 为“icontract” ImageView 已打开片段。所以我在 heros_Fragment.java 中创建了一个方法 trac(View) 当我尝试在 MainActivity 上创建它时出现很多错误。
方法 trac(View v) 应该在包含可点击 ImageView 的片段中，即 heros_fragment。并且该片段应该与主要活动相关联。如果您需要有关使用 Fragments 的任何基础知识，请查看我发布的 youtube 播放列表。

【解决方案2】：

感谢古丁的帮助。你真的帮了我。片段非常难以理解。我解决了我的问题。

package com.****.****;

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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;

/**
 * Created by Calvin on 27/12/2014.
 */
public class heroes_Fragment extends Fragment implements OnClickListener{
    Button btnChange;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view =  inflater.inflate(R.layout.heroes_layout, container, false);

        ImageButton btntrac = (ImageButton) view.findViewById(R.id.icontrac);
        btntrac.setOnClickListener(this);
        return view;
    }

    public void onClick(View v) {
        trac(v);
    }
android.support.v4.app.FragmentManager manager;
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        manager=getFragmentManager();

    }

    public void trac(View view) {
        android.support.v4.app.FragmentTransaction transaction =manager.beginTransaction();
        transaction.replace(R.id.container,new trac_Fragment());
        transaction.addToBackStack(null);
        transaction.commit();
    }


}

这是有效的。

【讨论】：