Question

我正在学习Android并遵循Wingnity的教程。我正在使用Android Studio 2.1.3。

我有2个java类（MainActivity和SimpleFragmentActivity）和3个布局（activity_main，activity_simple_fragment和片段简单（空））。

我不确定我的代码有什么问题。试图搜索解决方案，但代码似乎是正确的。

MainActivity

package com.example.ramosva.sunshine;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;


/**
 * A simple {@link Fragment} subclass.
 */
public class SimpleFragmentActivity extends AppCompatActivity {


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

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

        if(savedInstanceState == null){
            getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    public static class PlaceholderFragment extends Fragment{

        public PlaceholderFragment(){

        }

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

            Button btnClickMeGym = (Button)rootview.findViewById(R.id.btnSimpleFragGym);
            btnClickMeGym.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    Toast.makeText(getActivity(), "You clicked me Gym", Toast.LENGTH_SHORT).show();
                }
            });
            return rootview;
        }

    }

}

SimpleFragmentActivity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity"
    tools:ignore="MergeRootFrame" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Simple Fragment"
        android:id="@+id/btnSimpleFragmentMain"
        android:layout_gravity="center_horizontal"
      android:onClick="simples" />


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button2"
        android:layout_gravity="center_horizontal" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

布局

activity_main

<RelativeLayout 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="com.example.ramosva.sunshine.SimpleFragmentActivity">

    <!-- TODO: Update blank fragment layout -->
    <!--<TextView-->
        <!--android:layout_width="match_parent"-->
        <!--android:layout_height="match_parent"-->
        <!--android:text="@string/hello_blank_fragment" />-->


    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:id="@+id/imageView"
        android:scaleType="centerCrop"
        android:src="@drawable/carls" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click Me!"
        android:id="@+id/btnSimpleFragGym"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="60dp" />
</RelativeLayout>

activity_simple_fragment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

</LinearLayout>

fragment_simple

01-01 23:27:10.865 27075-27075/com.example.ramosva.sunshine W/System: ClassLoader referenced unknown path: /data/app/com.example.ramosva.sunshine-1/lib/arm
01-01 23:27:11.005 27075-27075/com.example.ramosva.sunshine W/System: ClassLoader referenced unknown path: /data/app/com.example.ramosva.sunshine-1/lib/arm
01-01 23:27:11.150 27075-27075/com.example.ramosva.sunshine W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
01-01 23:27:11.295 27075-27075/com.example.ramosva.sunshine D/SecWifiDisplayUtil: Metadata value : none
01-01 23:27:11.300 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{a7cb583 I.E...... R.....ID 0,0-0,0}
01-01 23:27:11.300 27075-27167/com.example.ramosva.sunshine D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
01-01 23:27:11.355 27075-27167/com.example.ramosva.sunshine D/libEGL: eglInitialize EGLDisplay = 0xae27f7c4
01-01 23:27:11.355 27075-27167/com.example.ramosva.sunshine I/OpenGLRenderer: Initialized EGL, version 1.4
01-01 23:27:11.360 27075-27167/com.example.ramosva.sunshine D/mali_winsys: new_window_surface returns 0x3000,  [1440x2560]-format:1
01-01 23:27:11.410 27075-27075/com.example.ramosva.sunshine W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
01-01 23:27:11.490 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
01-01 23:27:11.515 27075-27075/com.example.ramosva.sunshine I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@ff58432 time:10330371
01-01 23:27:13.795 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:13.880 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:14.585 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:14.700 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:14.940 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:15.020 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:15.105 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:15.205 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:15.345 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:15.435 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:15.645 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:15.735 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:16.050 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:16.155 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:16.440 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:27:16.510 27075-27075/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:27:16.515 27075-27075/com.example.ramosva.sunshine D/AndroidRuntime: Shutting down VM
01-01 23:27:16.520 27075-27075/com.example.ramosva.sunshine E/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.example.ramosva.sunshine, PID: 27075
                                                                              java.lang.IllegalStateException: Could not find method simples(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'btnSimpleFragmentMain'
                                                                                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
                                                                                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
                                                                                  at android.view.View.performClick(View.java:5697)
                                                                                  at android.widget.TextView.performClick(TextView.java:10826)
                                                                                  at android.view.View$PerformClick.run(View.java:22526)
                                                                                  at android.os.Handler.handleCallback(Handler.java:739)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                  at android.os.Looper.loop(Looper.java:158)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:7225)
                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
01-01 23:27:18.590 27075-27075/com.example.ramosva.sunshine I/Process: Sending signal. PID: 27075 SIG: 9
01-01 23:44:07.140 29325-29325/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 0
01-01 23:44:07.230 29325-29325/com.example.ramosva.sunshine D/ViewRootImpl: ViewPostImeInputStage processPointer 1
01-01 23:44:07.235 29325-29325/com.example.ramosva.sunshine D/AndroidRuntime: Shutting down VM
01-01 23:44:07.235 29325-29325/com.example.ramosva.sunshine E/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.example.ramosva.sunshine, PID: 29325
                                                                              java.lang.IllegalStateException: Could not find method simples(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'btnSimpleFragmentMain'
                                                                                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
                                                                                  at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
                                                                                  at android.view.View.performClick(View.java:5697)
                                                                                  at android.widget.TextView.performClick(TextView.java:10826)
                                                                                  at android.view.View$PerformClick.run(View.java:22526)
                                                                                  at android.os.Handler.handleCallback(Handler.java:739)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                  at android.os.Looper.loop(Looper.java:158)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:7225)
                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

任何人都可以在这里指出错误。我只是按照Wingnity教程1：创建片段中使用的代码。

错误记录

{{1}}

Answer 1

更改此行

setContentView(R.layout.activity_simple_fragment);

到

 setContentView(R.layout.fragment_simple);

你不能在片段和root中覆盖2个相同的布局。它应该是不同的

Answer 2

您尝试通过调用getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();中的SimpleFragmentActivity向布局添加片段，但container中的布局ID不是activity_simple_fragment.xml。因此，您需要添加一个布局，并将其ID设置为container中的activity_simple_fragment.xml。

Answer 3

它说java.lang.IllegalStateException: Could not find method simples(View) in a parent or ancestor Context for android:onClick attribute defined on view class避免在XML中使用onClick。

public class MainActivity extends AppCompatActivity {

ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button = (Button) findViewById(R.id.btnSimpleFragmentMain);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) { 
            startActivity(new Intent(getApplicationContext(), SimpleFragmentActivity.class););
        }
    });
  }
}

下面

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Simple Fragment"
    android:id="@+id/btnSimpleFragmentMain"
    android:layout_gravity="center_horizontal"/>
    //onClick removed

错误：不幸的是，App已停止

3 个答案: