There seem to be many threads addressing this question, but none have worked for me. My problem is that whenever I start a new project, R is highlighted red, and the project will not run.
Luckily - for the sake of simplicity - I have not implemented any code, all the code in the project is simply the code created by the creation of a new project:
package com.abc.android.unnamed;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
The XML file remains unchanged:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.abc.android.unnamed.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
I have tried:
Deleting the project files and creating a new project
Doing Build > Clean Project, then Build > Rebuild Project
All of which yield the same result.
Each time, the Gradle Console displays:
What can I do to fix this issue?
After some digging, I fixed my problem. My antivirus (Bitdefender) was not giving access to aapt2.exe, as seen in the error from the Gradle Console.
This was not immediately obvious as I did not see any notification that it was blocked. Additionally, sample code was able to resolve R without any fuss, so I was confused why I was not able to get it working. After allowing aapt2.exe access, with a Gradle rebuild, there is no longer an issue.
I'm just gonna add this here as i can't comment yet, for anyone experiencing the same issue.
I think Windows Defender does the same thing. As soon as i shut off the real-time protection the symbol R was resolved.
Related
I have seen EditText that has a hint and when user taps on it the hint moves up reducing the font size and making the field editable by the user. When the user moves to another EditText leaving it blank the hint appears back in full size.
What is it and how can I add it in my activity on Android Studio using XML?
I am on Android Studio using Kotlin.
if you mean this
it is TextInputLayout
Add the dependency for the design support library inside the build.gradle (Module: app) file as shown below.
implementation 'com.google.android.material:material:<version>'
the latest version at this time is 1.2.0-alpha03 you can see latest version from mvnrepository
Then, you can use it like this in your xml layouts.
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/myTextInputLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/my_editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/YOUR_HINT"
android:singleLine="true"
android:textColor="#color/colorDarkestGray" />
</com.google.android.material.textfield.TextInputLayout>
This is TextInputLayout and you can use editText as child in it like this :
At first add the dependency for the design support library inside the build.gradle file as shown below.
implementation 'com.android.support:design:25.3.1'
And if you are using AndroidX use this :
implementation 'com.google.android.material:material:1.0.0'
Second ,Then implement that like this :
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="#dimen/activity_horizontal_margin">
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Floating Hint Enabled Default" />
</android.support.design.widget.TextInputLayout>
Android TextInputLayout Features
1-Enabling/Disabling floating hints
2-Enabling/Disabling floating hint animation
3-Displaying Error Messages
4-Showing Character Counter
5-Password Visibility Toggle and . . .
I want to drag and drop elements into the Design View but I just can't. I can't even see the attributes aside when click into the screen or the default TextView that says 'Hello World!'. I tried restarting Android Studio, rebuild the project, and I still have the problem.
The code below is from my file 'activity_main.xml'.
How did happened?
I just tried to add a 'GridLayout' into the screen design, but to use it I had to install a library to use that grid layout and since I did that, I can't use the design view anymore.
Even I get an 'IDE Fatal Error' (screenshot below).
error ide image:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Remove
implementation 'com.android.support.constraint:constraint-layout:+'
from your build.gradle (app)
Hopefully Solve this problem
When my activity receives a new intent via onNewIntent, it updates the data of three Views, an ImageView, a TextView, and a VideoView. The problem is, the two other views just flash, then disappear when my VideoView comes on. After scattering a few breakpoints, I discovered that they appear when their content is set, but disappear when VideoView.onStart() is called in my MediaPlayer.onPrepared() method. I also have an AlertDialog show up when the menu button is pressed. After pressing the menu button, it shows up. I'm on Android API 9, as this is the API on the device I'm working on. I really need help, so I'd appreciate any advice.
Here's the layout. I don't think it's the issue though:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:keepScreenOn="true" >
<TextView
android:id="#+id/marquee"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:ellipsize="marquee"
android:focusable="false"
android:marqueeRepeatLimit="marquee_forever"
android:scrollHorizontally="true"
android:singleLine="true"
android:textAppearance="#android:style/TextAppearance.Large"
android:textColor="#android:color/white" >
</TextView>
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_above="#id/marquee"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_gravity="center_vertical" />
<VideoView
android:id="#+id/video"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/marquee"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_alignWithParentIfMissing="true"
android:layout_toLeftOf="#+id/image" />
</RelativeLayout>
Take note that the TextView is meant to be a marquee; it's supposed to keep scrolling sideways, until it is disposed of. I discovered that when the text is too short for it to start the marquee, the TextView AND the ImageView disappear (as stated earlier, they appear for a split second, then disappear). However, when the text causes the marquee feature to activate, everything works.
CURRENTLY:
I got it to work by calling postInvalidateDelayed(500) on my ImageView and TextView after calling VideoView.start(). I think the start() method is causing the problem, and requires that other views call invalidate(). Also, for some reason, there needs to be a small delay in-between the call to start() and the call to invalidate().
The layout is the issue.
Your VideoView is declared as match_parent, match_parent, allowing it to consume the whole width and height of the screen. Since you declared it last on the xml file (You used RelativeLayout. Ordering matters), the TextView and the ImageView would be covered by the VideoView.
If you're confused,
match_parent is basically the same as fill_parent. It's just another name for fill_parent in android 2.3+
Now what can you do about it?
Reorder your views in such a way that the largest is declared first. In this case, VideoView, then ImageView, then TextView.
Also note that your ImageView has height set to fill_parent - you may not want that.
I created a method, but it seems very bad:
private void startVideo() {
this.videoView.start();
if (this.imageView != null)
this.imageView.postInvalidateDelay(500);
if (this.textView != null)
this.textView.postInvalidateDelay(500);
}
It works, but it makes me feel dirty.
I want to create the click effect on the following type of custom title Bar.
There are three functions in here:Home,Title and Search, clicking either of it should perform the further function.
I was following this
http://staticallytyped.wordpress.com/2011/03/18/android-dynamic-and-custom-title-bars/
But i want the effect which i have posted above.
The thing you are talking about is called Action Bar. This is specially designed for Android Tablets. But developers have made Action Bar available for Android Mobile Phones too.
Have a look at Action Bar written by johannilsson. You can simply download this library project and customize according to your need and then integrate this library to your project.
Other Action Bar examples :
Xoriant Action Bar --
Note : THIS IS THE SAME THING THAT YOU WANT as you want to have Home, Search and Title on it.
Thiranjith blogspot
Just try this..
1) First create two layouts like main & custom_title
2) You must include the drawables which type like you've posted here. And, use this code.
main.xml - Just designed whatever you want.
custom_title.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="35dip"
android:gravity="center_vertical"
android:paddingLeft="5dip"
android:background="#323331">
<Button
android:id="#+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="hello"
android:text="Button" />
</LinearLayout>
Main.java
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);
}
public void hello(View view)
{
Toast.makeText(getApplicationContext(), "Hi, this is test.", Toast.LENGTH_LONG).show();
}
Change this code to your needs. Hope this helps you.
I would like to be able to define a ShapeDrawable in my layout file and then inflate that so I can draw on it.
I have followed the tutorial on the android developers' site but I cannot see how I reference my ShapeDrawable in my main class file.
How do I actually inflate it?
I have put the following the following into my layout file:
<com.example.shapedrawable.CustomDrawableView
android:id="#+id/customDrawableView"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
Once you have defined the ShapeDrawable in its own XML file, you need to add the following to the layout.xml where you want it to be included:
<ImageView
android:src="#drawable/shapeDrawable_filename"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
If you want to do it programmatically, I don't have an answer (yet), but from your question, it seems this should work!
Let me know if that helps ;)