我已经处理这个问题有一段时间了,并查看了我能找到的所有相关问题,例如:this one https://stackoverflow.com/questions/34567192/could-not-find-method-addcontactview-in-a-parent-or-ancestor-context, this one https://stackoverflow.com/questions/36446524/java-lang-illegalstateexception-could-not-find-method-view-in-a-parent-or-anc, and this one https://stackoverflow.com/questions/35140197/error-could-not-find-method-submitregisterview-in-a-parent-or-ancestor-contex。你能帮我纠正这个错误吗?这是 logcat 抛出的唯一一个。
java.lang.IllegalStateException: Could not find method playPauseMusic(View) in a parent or
ancestor Context for android:onClick attribute defined on view class
android.support.v7.widget.AppCompatImageButton with id 'playPause'
相关代码:
广播.java
package com.example.jacob.wutk;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import java.io.IOException;
public class radio extends AppCompatActivity {
/** Called when the user touches the button */
public void playPauseMusic (View view, final ImageButton playPause) throws IOException {
String url = "http://streamer.cci.utk.edu:8000/wutk-vorbis"; // your URL here
final MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mediaPlayer){
mediaPlayer.start();
}
});
playPause.setOnClickListener(new View.OnClickListener(){
public void onClick(View view) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
playPause.setImageResource(R.drawable.play1);
} else {
playPause.setImageResource(R.drawable.pause1);
}
}
});
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(url);
mediaPlayer.prepareAsync();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_radio);
}
}
活动无线电.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
tools:context="com.example.jacob.wutk.radio">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left|center_vertical"
android:scaleType="centerCrop"
android:src="@drawable/background_mic1"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingBottom="1.0dip"
android:paddingLeft="4.0dip"
android:paddingRight="4.0dip"
android:paddingTop="5.0dip">
<ImageButton
android:id="@+id/playPause"
android:layout_width="0.0dip"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:background="?android:selectableItemBackground"
android:clickable="true"
android:onClick="playPauseMusic"
android:scaleType="fitCenter"
android:src="@drawable/play1"/>
<ImageView
android:layout_width="0.0dip"
android:layout_height="fill_parent"
android:layout_marginRight="5dp"
android:layout_weight="1.0"
android:background="?android:selectableItemBackground"
android:scaleType="fitCenter"
android:src="@drawable/logo"/>
</LinearLayout>
</FrameLayout>
定义onClick
in xml
意味着您需要为特定视图定义它,这里是ImageButton
该方法中不能有两个参数。
你的错误还表明找不到方法 playPauseMusic(View)意味着编译器需要一个具有单个参数的公共方法View
,而你有两个参数:View
& ImageButton
.
这就是您收到该错误的原因。只需从方法中删除一个参数,它就会起作用。
像这样做 :
public class radio extends AppCompatActivity {
/** Called when the user touches the button */
public void playPauseMusic (View playPause) {
String url = "http://streamer.cci.utk.edu:8000/wutk-vorbis"; // your URL here
final MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mediaPlayer){
mediaPlayer.start();
}
});
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
((ImageButton)playPause).setImageResource(R.drawable.play1);
} else {
((ImageButton)playPause).setImageResource(R.drawable.pause1);
}
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(url);
mediaPlayer.prepareAsync();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_radio);
}
}
还要写一件事android:onClick="playPauseMusic"
意味着方法playPauseMusic
将在按钮单击时调用,因此您已经定义了按钮单击,因此不需要在方法内部定义它 by playPause.setOnClickListener
所以我删除了该代码。
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