Android Studio Button Clock crashes program

Question

While following the tutorial: http://developer.android.com/training/basics/firstapp/starting-activity.html, and got help form: My First App crashes when pressing a button, I still (after reading the answers to the question) can't figure out how to fix the problem.

My Code: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.buttonactivity1.app" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.buttonactivity1.app.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="com.example.buttonactivity1.DisplayMessageActivity"
            android:label="@string/title_activity_display_message"
            android:parentActivityName="com.example.buttonactivity1.MainActivity"

>

</manifest>

MainActivity.java:

package com.example.buttonactivity1.app;

import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.content.Intent; import android.widget.EditText;

public class MainActivity extends ActionBarActivity { public final static String EXTRA_MESSAGE = "com.example.buttonactivity1.MESSAGE";

/** Called when the user clicks the Send button */
public void sendMessage(View view) {
    // Do something in response to button
    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);
}

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


@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

DisplayMessageActivity.java:

package com.example.buttonactivity1.app;

import android.support.v7.app.ActionBarActivity; import android.os.Bundle; //import android.view.MenuItem; //importandroid.view.View; import android.support.v4.app.Fragment; //import android.view.LayoutInflater; import android.view.*; import android.content.Intent; import android.widget.TextView;

/** * Created by Neil on 4/21/14. */ public class DisplayMessageActivity extends ActionBarActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

    // Get the message from the 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);

    // Set the text view as the activity layout
    setContentView(textView);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() { }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_display_message,
                container, false);
        return rootView;
    }
}

}

ActivityMain.xml:

<EditText android:id="@+id/edit_message"
    android:layout_weight="1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:hint="@string/edit_message" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/button_send"
    android:onClick="sendMessage" />

fragment_display_message:

tools:context="com.example.myfirstapp.DisplayMessageActivity$PlaceholderFragment"

Error (logcat):

04-22 16:15:23.433 23203-23203/com.example.buttonactivity1.app W/IInputConnectionWrapper﹕ showStatusIcon on inactive InputConnection 04-22 16:38:28.402 24414-24414/com.example.buttonactivity1.app D/AndroidRuntime﹕ Shutting down VM 04-22 16:38:28.402 24414-24414/com.example.buttonactivity1.app W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40015578) 04-22 16:38:28.550 24414-24414/com.example.buttonactivity1.app E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.IllegalStateException: Could not execute method of the activity at android.view.View$1.onClick(View.java:2154) at android.view.View.performClick(View.java:2537) at android.view.View$PerformClick.run(View.java:9157) at android.os.Handler.handleCallback(Handler.java:587) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at android.view.View$1.onClick(View.java:2149)             at android.view.View.performClick(View.java:2537)             at android.view.View$PerformClick.run(View.java:9157)             at android.os.Handler.handleCallback(Handler.java:587)             at android.os.Handler.dispatchMessage(Handler.java:92)             at android.os.Looper.loop(Looper.java:130)             at android.app.ActivityThread.main(ActivityThread.java:3687)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:507)             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)             at dalvik.system.NativeStart.main(Native Method) Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.buttonactivity1.app/com.example.buttonactivity1.app.DisplayMessageActivity}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379) at android.app.Activity.startActivityForResult(Activity.java:2827) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:839) at android.app.Activity.startActivity(Activity.java:2933) at com.example.buttonactivity1.app.MainActivity.sendMessage(MainActivity.java:21)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:507)             at android.view.View$1.onClick(View.java:2149)             at android.view.View.performClick(View.java:2537)             at android.view.View$PerformClick.run(View.java:9157)             at android.os.Handler.handleCallback(Handler.java:587)             at android.os.Handler.dispatchMessage(Handler.java:92)             at android.os.Looper.loop(Looper.java:130)             at android.app.ActivityThread.main(ActivityThread.java:3687)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:507)             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)             at dalvik.system.NativeStart.main(Native Method)

In the other question, I saw the "fragment_main.xml" and "activity_display_message.xml" files. Do I need to have them? is that what's causing the problem?

Answer 1

It seems you have got a problem about your Manifest file.

You added com.example.buttonactivity1.DisplayMessageActivity but code try to run different path

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.buttonactivity1.app/com.example.buttonactivity1.app.DisplayMessageActivity}; have you declared this activity in your AndroidManifest.xml?

Answer 2

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.buttonactivity1.app/com.example.buttonactivity1.app.DisplayMessageActivity}; have you declared this activity in your AndroidManifest.xml?

You failed to add DisplayMessageActivity to your manifest in an <activity> element.