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Android Build a Simple Android App (2014) Basic Android Programming Adding the onClick() Method

Joel Rodriguez
Joel Rodriguez
473 Points

My emulator isn't loading my app. It would say something like "Unfortunately, (name of app) has stopped working"

Emulator seems to be working good but my app won't run, please help me. Also would love if someone would tell me how I could connect my android phone to android studio. Thanks :).

here is my AndroidManifest.xml code

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="dreamfactory.funfacts2">

            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />


My main activity file

package dreamfactory.funfacts2;

import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.View; import android.view.Menu; import android.view.MenuItem; import android.widget.Button; import android.widget.TextView;

public class FunFactsApp extends AppCompatActivity {

protected void onCreate(Bundle savedInstanceState) {
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();

            // Declare our View variables and assign them the views from the layout file
            final TextView factLabel = (TextView) findViewById(R.id.factTextView);
            Button showFactButton = (Button) findViewById(R.id.showFactButton);
            View.OnClickListener listener = new View.OnClickListener() {
                public void onClick(View v) {
                    // The button was clicked, so update the fact label with a new fact
                    String fact = "Ostriches can run faster than horses.";


public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_fun_facts_app, menu);
    return true;

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();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;

    return super.onOptionsItemSelected(item);


1 Answer

Sounds like there is something wrong with the app and not the emulator. Try to do some debugging. It is a very useful thing to practice.

To use your device for testing the first thing you have to do is enable developer options (google it and you'll find good descriptions with screenshots). Then connect your phone to your machine. If you're using a mac you don't need to do anything else. If you have a windows machine then you will need to install drivers. Again, you will need to use google to find how to set up your particular device.

Joel Rodriguez
Joel Rodriguez
473 Points

How do I debug? And thank you, I successfully connected my phone to the computer but it still says "Unfortunately (app name) has stopped working).