私はGoogleのサイトの開発ガイドに従っていました:http://developer.android.com/training/basics/firstapp/starting-activity.html
しかし、エミュレーターのボタンを押すと、アプリがクラッシュします。私は自分の携帯電話でそれを試しましたが、同じ結果が得られました。これが私のコードですインデントがここで正しく機能していません主なアクティビティ:
package com.example.rishubs.app;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = "com.example.myapp.MESSAGE";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
/** Called when Button is pressed */
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}
私のXML:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.rishubs.app"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".DisplayMessageActivity"
android:label="@string/app_name">
</activity>
</application>
</manifest>
私の2番目の活動
package com.example.rishubs.app;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class DisplayMessageActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get Message from intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
}
}
更新されたXML:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.rishubs.app"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".DisplayMessageActivity"
android:label="@string/app_name">
</activity>
<activity android:name="DisplayMessageActivity">
</activity>
</application>
</manifest>
Logcat:
07-15 18:48:26.605: E/AndroidRuntime(1454): FATAL EXCEPTION: main
07-15 18:48:26.605: E/AndroidRuntime(1454): java.lang.IllegalStateException: Could not find a method send message(View) in the activity class com.example.rishubs.app.MainActivity for onClick handler on view class android.widget.Button
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.view.View$1.onClick(View.java:3031)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.view.View.performClick(View.java:3511)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.view.View$PerformClick.run(View.java:14105)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.os.Handler.handleCallback(Handler.java:605)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.os.Handler.dispatchMessage(Handler.java:92)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.os.Looper.loop(Looper.java:137)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.app.ActivityThread.main(ActivityThread.java:4424)
07-15 18:48:26.605: E/AndroidRuntime(1454): at java.lang.reflect.Method.invokeNative(Native Method)
07-15 18:48:26.605: E/AndroidRuntime(1454): at java.lang.reflect.Method.invoke(Method.java:511)
07-15 18:48:26.605: E/AndroidRuntime(1454): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-15 18:48:26.605: E/AndroidRuntime(1454): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-15 18:48:26.605: E/AndroidRuntime(1454): at dalvik.system.NativeStart.main(Native Method)
07-15 18:48:26.605: E/AndroidRuntime(1454): Caused by: java.lang.NoSuchMethodException: send message [class android.view.View]
07-15 18:48:26.605: E/AndroidRuntime(1454): at java.lang.Class.getConstructorOrMethod(Class.java:460)
07-15 18:48:26.605: E/AndroidRuntime(1454): at java.lang.Class.getMethod(Class.java:915)
07-15 18:48:26.605: E/AndroidRuntime(1454): at android.view.View$1.onClick(View.java:3024)
07-15 18:48:26.605: E/AndroidRuntime(1454): ... 11 more