Eclipse生成无效活动

Question

I am currently working on an android project for school named MyContactList and at first when I generated new Activities it worked fine.
However, now when I generate new Activities it pops out a ton of errors.
How do I go about generating a new activity: Right click com.example.mycontactlist under source > new > other > android activity > blank activity.

It generates the files fine. However, after generating, it shows these errors:

The code generated in the old Activities and in the new one is different.

Old:

package com.example.mycontactlist;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.android.gms.maps.GoogleMap.OnMyLocationChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.common.ConnectionResult;

import android.app.Fragment;
import android.os.Bundle;

import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.MarkerOptions;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Point;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Build;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.view.Display;
import android.view.Menu;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

public class ContactMapActivity extends FragmentActivity {

New:

package com.example.mycontactlist;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class ContactSensorActivity extends ActionBarActivity {
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact_sensor);
    }
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.contact_sensor, 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);
}
}

I tried copying and pasting an old Activity and changing the code around to use as a new one.
I also tried creating one from scratch but each time it crashes and I am unable to find what the error is due to.

I have to test on my cellphone and currently do not know how to get it to notify me of crash errors.

The reason I can't check it in the emulator is due to an old issue I had with google play services and my app: it didn't like my app and wouldn't update, so I run tests that have to do with the map portion of my code on my cellphone.

My question is: how do I get it to generate an Activity like my old one?

Eclipse is generating different code than I expected when creating a new Activity.

Answer 1

You are creating different types of activities. You can learn about different types of activities here: https://developer.android.com/studio/projects/templates.html I think you are creating a Navigation Drawer activity.

Answer 2

1. Use Android Studio or convince your professor/class that it is the tool to use. Eclipse has long been abandoned for Android development. The code is what you are learning anyway, not the tool to compile it.

2. There is no way an empty / blank Activity template creates that "old" code. That is a Google Map activity.

3. android.app.support.v7 libraries are missing. The majority of your compilation errors relate to that. You are missing a JAR file (since you are using Eclipse) or a Gradle dependency (if you even use Gradle).

4. activity_contact_sensor.xml have been generated by the IDE tools. It also should be able to resolve if the remainder of your code can compile.

tl;dr Not sure how that "old" code was generated. Use Android Studio