I am a novice android developer. I am trying to create a splash screen. I have a png image.
I have created an empty splash screen with a text box.I have 2 activities - MainActivity and SecondActivity.
code:
public class MainActivity extends AppCompatActivity {
private static int SPLASH_SCREEN_TIME_OUT=2000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent i=new Intent(MainActivity.this,
SecondActivity.class);
//Intent is used to switch from one activity to another.
startActivity(i);
//invoke the SecondActivity.
finish();
//the current activity will get finished.
}
}, SPLASH_SCREEN_TIME_OUT);
}
}
public class SecondActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".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" />
<ImageView
android:id="#+id/imageView"
android:layout_width="250dp"
android:layout_height="200dp"
app:srcCompat="#drawable/geeks"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.447" />
</androidx.constraintlayout.widget.ConstraintLayout>
But app:srcCompat="#drawable/geeks" is in red color. Means it is not resolved. Where shall I copy the png image for the splash screen? I have not copied the image anywhere in android studio. Without the image view, the splash screen runs fine showing hello world.
Few things to keep in mind.
The image size should be low (not more than 150-200kb)
Instead of adding text and image on the activity, design a splash screen using Illustrator or any other medium and save it in png format.
Store this in the res/drawable.
In the activity_main, just add line android:background ="#drawable/geeks".
In AndroidManifest.xml, add, android:theme="#style/Theme.<app name>.NoActionBar"
first you need to put your image in res/drawable folder:
and then access it by app:srcCompat or android:src attribute of ImageView inside your activity_main.xml:
app:srcCompat="#drawable/company_logo"
android:src="#drawable/company_logo"
Try writing android : src ="#drawable/geeks", instead.
put them in assets folder. It'll resolve your problem.
Related
I am developing a small project of test, and I wrote the following code.
I already created in the xml file, a button with id called "registerBtn".
I erased the imports of this source code to shorten space of this source code.
In the java file, I created a variable called mRegisterBtn, in the type of Button.
Inside the method called onCreate(Bundle savedInstanceState) the mRegisterBtn receives the method called findViewById(R.id.registerBtn);
However, in the mRegisterBtn.setOnClickListener, the part of new View.OnClickListener appears in gray color, and it is not working when trying to test this code.
This image shows what I really mean. Please, perceive that the the part of new View.OnClickListener appears in gray color. It means a error. But trying to compile, this code runs, but the button simply does not work.
Can anyone know how to fix this error, please?
public class Register2 extends AppCompatActivity {
Button mRegisterBtn;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register2);
mRegisterBtn = findViewById(R.id.registerBtn);
mRegisterBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Testing", Toast.LENGTH_LONG).show();
}
});
}
}```
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
android:background="#007FFF"
tools:context=".Register">
<Button
android:id="#+id/registerBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="#color/white"
android:text="Register"
android:textColor="#color/black"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.499" />
</androidx.constraintlayout.widget.ConstraintLayout>
Try using the Activity itself as the Context.
If you want a log, then make one
If you want the gray to go away, use a lambda
Log.d("REGISTER", "Setting listener");
mRegisterBtn.setOnClickListener(view -> {
Log.d("REGISTER", "Clicked!");
Toast.makeText(Register2.this, "Testing", Toast.LENGTH_LONG).show();
});
I have MainActivity which has got a button that opens Activity 2. Everything from Activity 2 should be calculated and be run but the user should rest at MainActivity? How do I do this?
I found a solution where I dont run the "setContentView()" but then my app crashes.
You want to change the view of application but does not want the user to change activity.
Use two different layout in xml file with id :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/first_view">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button1"
android:id="#+id/button"
android:background="#358a32" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/second_view"
android:visibility="gone">
</LinearLayout>
<LinearLayout>
Then onclick of button :
public class MainActivity extends Activity {
boolean firstViewOff = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button) findViewById(R.id.button1);
LinearLayout first_view = (LinearLayout) findViewById(R.id.first_view);
LinearLayout second_view = (LinearLayout) findViewById(R.id.second_view);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
firstViewOff = true;
first_view.setVisibility(View.GONE);
second_view.setVisibility(View.VISIBLE);
}
});
}
#override
public void onBackPressed(){
super.onBackPressed();
if(firstViewOff){
second_view.setVisibility(View.GONE);
first_view.setVisibility(View.VISIBLE);
firstViewOff = false;
}
}
}
Why i attached backpressed :
Because when user backpress then it will just directly show firstview without closing,
I want to Set Image viewed in app as wallpaper.
While trying to do so image doesn't fit to screen of my device but its viewed properly using centerCrop.
This is my Code for the app.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
<ImageView
android:id="#+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:scaleType="centerCrop"
app:srcCompat="#drawable/image" />
<Button
android:id="#+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#color/transparent"
android:text="Set Wallpaper"
android:textColor="#ffffff" />
</RelativeLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setWallpaper();
}
});
}
private void setWallpaper(){
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());
try {
manager.setBitmap(bitmap);
Toast.makeText(this, "Wallpaper Set", Toast.LENGTH_SHORT).show();
}
catch (IOException e){
Toast.makeText(this, "Error", Toast.LENGTH_SHORT).show();
}
}
}
This is image used in App
Live App Screen
After Setting Wallpaper in android Device
How can I set image as wallpaper perfectly as used in XML file (scale to centerCrop) for setting it as perfect fit wallpaper for any android devices?
Use:
android:background="#drawable/image"
instead of:
app:srcCompat="#drawable/image"
So the problem is... I can't seem to find out why the image wont show up when I click the button.
Also found this in the logcat (if it means anything):
01-04 12:05:43.032 21338-21345/? E/art: Failed sending reply to debugger: Broken pipe
Here is content_main.xml
<LinearLayout
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"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_main"
tools:context="com.example.dylan.secondapp.MainActivity"
android:orientation="horizontal"
android:weightSum="1"
android:gravity="center_horizontal">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="100dp"
android:id="#+id/imageButton"
android:src="#00fe0000"
android:layout_weight="0.25" />
<ImageView
android:layout_width="100dp"
android:layout_height="174dp"
android:id="#+id/imageView"
android:layout_gravity="center_vertical"
android:layout_weight="0.43" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Okay Obama"
android:id="#+id/obamabutton"
android:layout_weight="0.25"
android:gravity="right" />
</LinearLayout>
Here is MainActivity.java:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
//Testing out button changing image to obama
addButtonClickListener();
}
});
}
public void addButtonClickListener()
{
Button obamabutton = (Button)findViewById(R.id.obamabutton);
obamabutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ImageView obama = (ImageView)findViewById(R.id.imageView);
obama.setImageResource(R.drawable.obama);
}
});
}
Try to put this:
Button obamabutton = (Button)findViewById(R.id.obamabutton);
obamabutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ImageView obama = (ImageView)findViewById(R.id.imageView);
BitmapFactory.Options ops = new BitmapFactory.Options();
ops.inSampleSize = 4;
ops.inDither = false;
ops.inMutable = true;
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.obama, ops);
obama.setImageBitmap(bitmap);;
}
});
right after
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Explanation: Right now you are specifying what should obamabutton do only when clicking on FAB(setting obamabutton's clickListener in FAB's click event)
EDIT: to handle OutOfMemoryError try to use updated code above. This will make your image size 1/4 of original size.
Try using set image drawable method as below
img=(ImageView)findViewById(R.id.yourimage)
Drawable d = getResources().getDrawable(R.drawable.yourimage)
img.setImageDrawable(d);
Hope it helps!
So far I know how to change the Background's color via html codes. Now I am Trying to change the background of the Layout of my main activity to different images using a button click. If possible using only one single button.
Thank you!
The following code is from this link Setting background image in java from Omi0301.
//assuming your Layout is named linearlayout1:
LinearLayout ll = (LinearLayout) findViewById(R.id.linearlayout1);
ll.setBackgroundResource(R.drawable.sample);
All you do is create a layout variable and set its background resource with the image that you would like it to be.
try to use "setImageResource" instead the "setBackgroundResourse"
Try below code
main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/myLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="64dp"
android:layout_marginTop="71dp"
android:text="changeColor" />
</LinearLayout>
MainActivity.java
public class MainActivity extends Activity {
/** Called when the activity is first created. */
Button button;
LinearLayout mainLayout;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mainLayout=(LinearLayout)findViewById(R.id.myLayout);
button=(Button)findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
mainLayout.setBackgroundResource(R.drawable.newImage);
}
});
}
}