CODEWITHSUNDEEP
javaandroidandroid-intent
user3388470
user3388470

Reputation: 91

Android App won't display in Android Studio Emulator

I am very new to Android development. I have tried to recreate an app where if you press a button, a message "new text string" is displayed. However, when I run the AVD and choose the Virtual Device, it doesn't display it. Just an old TestApp I had. Can anyone suggest a fix? I'd really appreciate it. My code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android=      "http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<TextView android:id="@+id/hello_text"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />


<Button android:id="@+id/trigger"
    android:layout_width="100dip" android:layout_height="100dip"
    android:text="@string/button1"
    android:layout_below="@+id/hello_text"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="111dp" />
 </RelativeLayout>

SimpleActivity.java

package com.example.simpleactivityexample;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import android.widget.*;
import android.view.View;
public class SimpleActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Toast.makeText(this, "onCreate", Toast.LENGTH_SHORT).show();
    Button startButton = (Button) findViewById(R.id.trigger);
    startButton.setOnClickListener(new View.OnClickListener()
    {
        private TextView tv = (TextView) findViewById(R.id.hello_text);
        public void onClick(View view)
        {
            tv.setText("new text string");
        }
    }
    );

}
@Override
protected void onStart() {
    super.onStart();
    Toast.makeText(this, "onStart", Toast.LENGTH_SHORT).show();
}
@Override
protected void onResume() {
    super.onResume();
    Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();
}
@Override
protected void onRestart() {
    super.onRestart();
    Toast.makeText(this, "onRestart", Toast.LENGTH_SHORT).show();
}
@Override
protected void onPause() {
    Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();
    super.onPause();
}
@Override
protected void onStop() {
    Toast.makeText(this, "onStop", Toast.LENGTH_SHORT).show();
    super.onStop();
}
@Override
protected void onDestroy() {
    Toast.makeText(this, "onDestroy", Toast.LENGTH_SHORT).show();
    super.onDestroy();
}


}

Manifest

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

<application
    android:debuggable="true"
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.simpleactivityexample.SimpleActivity"
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:label="@string/app_name"
        android:theme="@style/FullscreenTheme" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
  </application>

 </manifest>

Strings.xml 

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 <string name="app_name">Dietary Application</string>
 <string name="hello">Hello!</string>
 <string name="button1">This is a button!</string>
 </resources>

Upvotes: 4

Views: 21449

Answers (3)

user3388470
user3388470

Reputation: 91

I managed to solve it.I am using Android Studio by the way. I went to the run tab at the top of the screen and went into ''Edit Configurations''. I then ticked ''Show chooser dialog''. I started the AVD and when it was fully started, A pressed the run function(green triangle) and it started on the Android. Thanks so much to everyone who helped!

Upvotes: 3

Yaroslav Mytkalyk
Yaroslav Mytkalyk

Reputation: 17115

Are you using the latest studio? Seems like an old bug

Error when running emulator in Android Studio

Try waiting until the emulator boots, and then run the project.

Upvotes: 0

Mesher
Mesher

Reputation: 46

Your code seems fine; check the logcat and console outputs when you click 'Run as Android Application' to see if the install is working.

Logcat is located in the top menu under

Window- Show View - Other - Android - Logcat

Also try cleaning the project and restarting the emulator; and also, if the app doesn't show up when the emulator loads, try, without exiting the emulator, to run it again.

Upvotes: 0

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