"Konnte keine Methode ... in der Aktivitätsklasse ... für den onClick-Handler finden."
Ich arbeite an meinem ersten Android-Projekt. Ich benutze die ThinkGear API. Ich habe zwei Aktivitäten. Ich habe in der ersten Aktivität die Absicht, die zweite Aktivität zu starten. In meiner zweiten Aktivität habe ich eine Schaltfläche zum Abspielen eines Sounds und eine Schaltfläche zum Anhalten des Sounds. Wenn ich jedoch versuche, den Ton in der zweiten Aktivität abzuspielen, wird meine Anwendung beendet. Bitte weisen Sie auf die Fehler hin. Ich hänge sowohl die Java-Dateien als auch die Logcat-Datei an.
mindwave1.java
package com.example.mindwave1;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
//import android.util.Log;
//import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.neurosky.thinkgear.*;
public class MainActivity extends Activity {
BluetoothAdapter bluetoothAdapter;
TextView tv;
Button b;
TGDevice tgDevice;
final boolean rawEnabled = true;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.textView1);
tv.setText("");
tv.append("Android version: " + Integer.valueOf(android.os.Build.VERSION.SDK_INT) + "\n" );
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(bluetoothAdapter == null) {
// Alert user that Bluetooth is not available
Toast.makeText(this, "Bluetooth not available", Toast.LENGTH_LONG).show();
finish();
return;
}else {
/* create the TGDevice */
tgDevice = new TGDevice(bluetoothAdapter, handler);
}
}
@Override
public void onDestroy() {
tgDevice.close();
super.onDestroy();
}
/**
* Handles messages from TGDevice
*/
@SuppressLint("HandlerLeak")
private final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case TGDevice.MSG_STATE_CHANGE:
switch (msg.arg1) {
case TGDevice.STATE_IDLE:
break;
case TGDevice.STATE_CONNECTING:
tv.append("Connecting...\n");
break;
case TGDevice.STATE_CONNECTED:
tv.append("Connected.\n");
tgDevice.start();
break;
case TGDevice.STATE_NOT_FOUND:
tv.append("Can't find\n");
break;
case TGDevice.STATE_NOT_PAIRED:
tv.append("not paired\n");
break;
case TGDevice.STATE_DISCONNECTED:
tv.append("Disconnected mang\n");
}
break;
//case TGDevice.MSG_POOR_SIGNAL:
//signal = msg.arg1;
//tv.append("PoorSignal: " + msg.arg1 + "\n");
//break;
case TGDevice.MSG_RAW_DATA:
//raw1 = msg.arg1;
//tv.append("Got raw: " + msg.arg1 + "\n");
break;
case TGDevice.MSG_HEART_RATE:
tv.append("Heart rate: " + msg.arg1 + "\n");
break;
case TGDevice.MSG_ATTENTION:
//att = msg.arg1;
tv.setText("");
tv.append("Test number 1 for attention and meditation\n");
tv.append("Attention: " + msg.arg1 + "\n");
//Log.v("HelloA", "Attention: " + msg.arg1 + "\n");
break;
case TGDevice.MSG_MEDITATION:
tv.append("Meditation: " + msg.arg1 +"\n");
break;
case TGDevice.MSG_BLINK:
tv.append("Blink: " + msg.arg1 + "\n");
break;
case TGDevice.MSG_RAW_COUNT:
//tv.append("Raw Count: " + msg.arg1 + "\n");
break;
case TGDevice.MSG_LOW_BATTERY:
Toast.makeText(getApplicationContext(), "Low battery!", Toast.LENGTH_SHORT).show();
break;
case TGDevice.MSG_RAW_MULTI:
//TGRawMulti rawM = (TGRawMulti)msg.obj;
//tv.append("Raw1: " + rawM.ch1 + "\nRaw2: " + rawM.ch2);
default:
break;
}
}
};
public void nxt(View view)
{
Intent intent = new Intent(this, SecondPageActivity.class);
startActivity(intent);
}
public void doStuff(View view) {
if(tgDevice.getState() != TGDevice.STATE_CONNECTING && tgDevice.getState() != TGDevice.STATE_CONNECTED)
tgDevice.connect(rawEnabled);
//tgDevice.ena
}
}
SecondPageActivity.java
package com.example.mindwave1;
import android.os.Bundle;
import android.media.MediaPlayer;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;
public class SecondPageActivity extends Activity {
MediaPlayer mp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_page);
// Show the Up button in the action bar.
setupActionBar();
}
public void play(){
mp = MediaPlayer.create(SecondPageActivity.this, R.raw.music);
mp.start();
}
/**
* Set up the {@link android.app.ActionBar}.
*/
private void setupActionBar() {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second_page, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
Logcat-Datei
04-16 16:29:50.676: D/dalvikvm(13458): GC_FOR_ALLOC freed 65K, 2% free 7676K/7784K, paused 22ms, total 22ms
04-16 16:29:50.676: I/dalvikvm-heap(13458): Grow heap (frag case) to 8.899MB for 1436984-byte allocation
04-16 16:29:50.716: D/dalvikvm(13458): GC_FOR_ALLOC freed 1K, 2% free 9078K/9188K, paused 37ms, total 37ms
04-16 16:29:50.746: V/TGDevice(13458): EKG path: /storage/emulated/0/Android/data/com.neurosky.thinkgear/files/EKG/parameters
04-16 16:29:50.746: D/TGDevice(13458): Initialized. Version: 9
04-16 16:29:50.806: D/libEGL(13458): loaded /system/lib/egl/libEGL_tegra.so
04-16 16:29:50.826: D/libEGL(13458): loaded /system/lib/egl/libGLESv1_CM_tegra.so
04-16 16:29:50.846: D/libEGL(13458): loaded /system/lib/egl/libGLESv2_tegra.so
04-16 16:29:50.866: D/OpenGLRenderer(13458): Enabling debug mode 0
04-16 16:29:57.736: V/mindwave1(13458): appln2 start
04-16 16:30:06.076: D/AndroidRuntime(13458): Shutting down VM
04-16 16:30:06.076: W/dalvikvm(13458): threadid=1: thread exiting with uncaught exception (group=0x41834ba8)
04-16 16:30:06.076: E/AndroidRuntime(13458): FATAL EXCEPTION: main
04-16 16:30:06.076: E/AndroidRuntime(13458): Process: com.example.mindwave1, PID: 13458
04-16 16:30:06.076: E/AndroidRuntime(13458): java.lang.IllegalStateException: Could not find a method play(View) in the activity class com.example.mindwave1.SecondPageActivity for onClick handler on view class android.widget.Button with id 'button1'
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.view.View$1.onClick(View.java:3810)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.view.View.performClick(View.java:4438)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.view.View$PerformClick.run(View.java:18422)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.os.Handler.handleCallback(Handler.java:733)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.os.Handler.dispatchMessage(Handler.java:95)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.os.Looper.loop(Looper.java:136)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-16 16:30:06.076: E/AndroidRuntime(13458): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 16:30:06.076: E/AndroidRuntime(13458): at java.lang.reflect.Method.invoke(Method.java:515)
04-16 16:30:06.076: E/AndroidRuntime(13458): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-16 16:30:06.076: E/AndroidRuntime(13458): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-16 16:30:06.076: E/AndroidRuntime(13458): at dalvik.system.NativeStart.main(Native Method)
04-16 16:30:06.076: E/AndroidRuntime(13458): Caused by: java.lang.NoSuchMethodException: play [class android.view.View]
04-16 16:30:06.076: E/AndroidRuntime(13458): at java.lang.Class.getConstructorOrMethod(Class.java:472)
04-16 16:30:06.076: E/AndroidRuntime(13458): at java.lang.Class.getMethod(Class.java:857)
04-16 16:30:06.076: E/AndroidRuntime(13458): at android.view.View$1.onClick(View.java:3803)
04-16 16:30:06.076: E/AndroidRuntime(13458): ... 11 more
04-16 16:35:06.416: D/dalvikvm(13736): GC_FOR_ALLOC freed 69K, 2% free 7676K/7788K, paused 24ms, total 24ms
04-16 16:35:06.416: I/dalvikvm-heap(13736): Grow heap (frag case) to 8.900MB for 1436984-byte allocation
04-16 16:35:06.446: D/dalvikvm(13736): GC_FOR_ALLOC freed 1K, 2% free 9078K/9192K, paused 25ms, total 25ms
04-16 16:35:06.466: V/TGDevice(13736): EKG path: /storage/emulated/0/Android/data/com.neurosky.thinkgear/files/EKG/parameters
04-16 16:35:06.466: D/TGDevice(13736): Initialized. Version: 9
04-16 16:35:06.516: D/libEGL(13736): loaded /system/lib/egl/libEGL_tegra.so
04-16 16:35:06.536: D/libEGL(13736): loaded /system/lib/egl/libGLESv1_CM_tegra.so
04-16 16:35:06.546: D/libEGL(13736): loaded /system/lib/egl/libGLESv2_tegra.so
04-16 16:35:06.566: D/OpenGLRenderer(13736): Enabling debug mode 0
04-16 16:39:46.226: D/dalvikvm(13927): GC_FOR_ALLOC freed 73K, 2% free 7676K/7788K, paused 20ms, total 21ms
04-16 16:39:46.236: I/dalvikvm-heap(13927): Grow heap (frag case) to 8.899MB for 1436984-byte allocation
04-16 16:39:46.256: D/dalvikvm(13927): GC_FOR_ALLOC freed 1K, 2% free 9078K/9192K, paused 22ms, total 22ms
04-16 16:39:46.296: V/TGDevice(13927): EKG path: /storage/emulated/0/Android/data/com.neurosky.thinkgear/files/EKG/parameters
04-16 16:39:46.296: D/TGDevice(13927): Initialized. Version: 9
04-16 16:39:46.366: D/libEGL(13927): loaded /system/lib/egl/libEGL_tegra.so
04-16 16:39:46.376: D/libEGL(13927): loaded /system/lib/egl/libGLESv1_CM_tegra.so
04-16 16:39:46.396: D/libEGL(13927): loaded /system/lib/egl/libGLESv2_tegra.so
04-16 16:39:46.416: D/OpenGLRenderer(13927): Enabling debug mode 0
04-16 16:39:50.416: V/mindwave1(13927): appln2 start
04-16 16:39:51.666: D/AndroidRuntime(13927): Shutting down VM
04-16 16:39:51.666: W/dalvikvm(13927): threadid=1: thread exiting with uncaught exception (group=0x41834ba8)
04-16 16:39:51.676: E/AndroidRuntime(13927): FATAL EXCEPTION: main
04-16 16:39:51.676: E/AndroidRuntime(13927): Process: com.example.mindwave1, PID: 13927
04-16 16:39:51.676: E/AndroidRuntime(13927): java.lang.IllegalStateException: Could not find a method play(View) in the activity class com.example.mindwave1.SecondPageActivity for onClick handler on view class android.widget.Button with id 'button1'
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.view.View$1.onClick(View.java:3810)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.view.View.performClick(View.java:4438)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.view.View$PerformClick.run(View.java:18422)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.os.Handler.handleCallback(Handler.java:733)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.os.Handler.dispatchMessage(Handler.java:95)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.os.Looper.loop(Looper.java:136)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-16 16:39:51.676: E/AndroidRuntime(13927): at java.lang.reflect.Method.invokeNative(Native Method)
04-16 16:39:51.676: E/AndroidRuntime(13927): at java.lang.reflect.Method.invoke(Method.java:515)
04-16 16:39:51.676: E/AndroidRuntime(13927): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-16 16:39:51.676: E/AndroidRuntime(13927): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-16 16:39:51.676: E/AndroidRuntime(13927): at dalvik.system.NativeStart.main(Native Method)
04-16 16:39:51.676: E/AndroidRuntime(13927): Caused by: java.lang.NoSuchMethodException: play [class android.view.View]
04-16 16:39:51.676: E/AndroidRuntime(13927): at java.lang.Class.getConstructorOrMethod(Class.java:472)
04-16 16:39:51.676: E/AndroidRuntime(13927): at java.lang.Class.getMethod(Class.java:857)
04-16 16:39:51.676: E/AndroidRuntime(13927): at android.view.View$1.onClick(View.java:3803)
04-16 16:39:51.676: E/AndroidRuntime(13927): ... 11 more