Question

我试图根据this link,运行“清洁代码”但是没有发生任何事情。作为一名Renegade开发人员，我的直觉说“Button onClick”不见了，但我可能错了。这是根据说明书编写的代码：

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;

public class BuildingaSimpleUserInterfaceApi8Activity extends Activity {
    public final static String EXTRA_MESSAGE = "com.developer.android.com_training_basics_firstapp_building_ui.DISPLAYMESSAGEACTIVITY";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    /**This is how I work with Buttons and the Next Activity, however this method IS NOT defind
     * in the very first Android Tutorial for sending information onClick.
            Button bButtonone = (Button) findViewById(R.id.button_send);
            bButtonone.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {
            // TODO Auto-generated method stub
            startActivity(new Intent("com.developer.android.com_training_basics_firstapp_building_ui.DISPLAYMESSAGEACTIVITY"));
                    }
                });
        }
       */   

    /** Called when the user selects 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);
    }
}

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.developer.android.com_training_basics_firstapp_building_ui"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".BuildingaSimpleUserInterfaceApi8Activity"
            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.developer.android.com_training_basics_firstapp_building_ui.DisplayMessageActivity" />

    </application>

</manifest>

Answer 1

您似乎忘记了开始活动的行：

public void sendMessage(View view) {
    ...
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent); // add me!
}

Answer 2

我仔细阅读了所列网站上的代码，但您错过了一行：

startActivity(intent);

最后是sendMessage。

来自Root Developer Page Activity的Android Step 1无法正常工作

2 个答案: