java.lang.IllegalStateException：在 android:onClick 屬性定義的父或祖先上下文中找不到方法 play(View)

Question

我創建了一個程序，在其中添加了一個視頻和 3 個按鈕。 當我在手機上運行時，程序崩潰了。 java.lang.IllegalStateException: Could not find method play(View) in a parent or ancestor Context for android:onClick attribute defined on view class androidx.appcompat.widget.AppCompatButton with id 'video_play' at androidx.appcompat.app.AppCompatViewInflater$ DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:436) 這是我的代碼

 VideoView videoPlayer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_home);
        videoPlayer =  (VideoView)findViewById(R.id.videoPlayer);
        String uripath="android.resource://" + getPackageName() + "/" + R.raw.peds;
        Uri myVideoUri= Uri.parse(uripath);
        videoPlayer.setVideoURI(myVideoUri);
    }
    public void play(View view){
        videoPlayer.start();
    }
    public void pause(View view){
        videoPlayer.pause();
    }
    public void stop(View view){
        videoPlayer.stopPlayback();
        videoPlayer.resume();
    }

這里是 XML

<Button
        android:id="@+id/video_play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/videoPlayer"
        android:layout_marginTop="0dp"
        android:onClick="start"
        android:paddingLeft="20dp"
        android:text="Play"
        android:fontFamily="@font/kras"
        android:textColor="#C62828"
        android:shadowColor="#000000"
        android:shadowDx="4.4"
        android:shadowDy="2.4"
        android:shadowRadius="1"
        android:textSize="19sp"/>

    <Button
        android:id="@+id/video_pause"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/videoPlayer"
        android:layout_marginTop="0dp"
        android:layout_marginRight="-214dp"
        android:layout_toLeftOf="@id/video_play"
        android:onClick="pause"
        android:text="Pause"/>

    <Button
        android:id="@+id/video_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/videoPlayer"
        android:layout_marginTop="0dp"
        android:layout_marginRight="-324dp"
        android:layout_toLeftOf="@id/video_play"
        android:onClick="stop"
        android:text="Stop"
        android:textSize="19sp"/>

Answer 1

在 xml 中添加我們的播放按鈕：

android:onClick="play"

添加到 xml 中的暫停按鈕

android:onClick="pause"

添加到 xml 中的停止按鈕

android:onClick="stop"

更新

看看我上面所說的，並通過 ID 找到按鈕：

private Button playButton;
private Button pauseButton;
private Button stopButton;


videoPlayer =  (VideoView)findViewById(R.id.videoPlayer);
//add these here
playButton =  (Button)findViewById(R.id.video_play);
pauseButton =  (Button)findViewById(R.id.video_pause);
stopButton =  (Button)findViewById(R.id.video_stop);
...
...