#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);
button.setOnClickListener(this);
int height = this.getWindow().getDecorView().getHeight();
int width = this.getWindow().getDecorView().getWidth();
bitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888 );
canvas = new Canvas(bitmap);
imageView = findViewById(R.id.imageView);
}
#Override
public void onClick(View v) {
if (v.getId() == R.id.button){
canvas.drawColor(Color.RED);
}
imageView.setImageBitmap(bitmap);
}
}
Does anyone have any idea why the above code snippet for Android Studio would cause the app to crash constantly? I'm new to Android Studio and I want to get used to building rectangles and shapes before anything more, but it seems I'm having difficulty with even that.
Displays error of drawing Bitmap with values not > 0, but the issue is that after using a print function in onClick, grabbing height or width from either window or the imageView, I am returned a value > 0, so I don't understand.
You are getting height and width in onCreate method before view has been drawn and thus resulting in returning height 0, width 0 since android system don't know exact width and height of view.You can use some method like post(Runnable) to know if view has drawn.Modify you code like below.
View view = this.getWindow().getDecorView();
view.post( new Runnable() {
#Override
public void run() {
width = view.getMeasuredWidth();
height = view.getMeasuredHeight();
bitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888 );
canvas = new Canvas(bitmap);
}
});
Related
I am trying to change the color of the image in red or any other I wrote the following code but after running my application nothing will happen in my emulator
My Code is
public class MainActivity extends AppCompatActivity {
int x=0,y=0;
ImageView imViewAndroid,displayimg;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imViewAndroid = (ImageView) findViewById(R.id.imViewAndroid);
displayimg = (ImageView) findViewById(R.id.setimageview);
Bitmap bitmap = ((BitmapDrawable)imViewAndroid.getDrawable()).getBitmap();
int pixel = bitmap.getPixel(x,y);
for(int i=0;i<imViewAndroid.getWidth();i++){
for(int j=0;i<imViewAndroid.getHeight();j++)
{
pixel=bitmap.getPixel(i,j);
bitmap.setPixel(i,j,Color.RED);
displayimg.setImageBitmap(bitmap);
}
}
And my emulator shows thisbenter image description here
My focus is to get this reult
enter image description here
One way to achieve that is by using ColorFilter.
ColorFilter overlay = new PorterDuffColorFilter(Color.YELLOW, PorterDuff.Mode.OVERLAY);
Drawable drawable = imageView.getBackground();
drawable.setColorFilter(overlay);
imageView.setBackground(drawable);
I am trying to set the height and width of an imageview to be twice the size of the height and width of the screen, which obviously changes depending on what device is used.
This is what I attempted (but the imageview was just invisible):
public class MainActivity extends AppCompatActivity {
private ImageView Geoline;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Geoline = findViewById(R.id.Geoline);
//Fetching the Device Resolution
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int scrWidth = size.x;
int scrHeight = size.y;
//Creating variables that are twice the size of screen resolutions
int scalex = 2 * scrWidth;
int scaley = 2 * scrHeight;
//Setting the screen width and height to equal that of variables "scalex" and "scaley"
Geoline.setScaleX(scalex);
Geoline.setScaleY(scaley);
}
You are trying to do this in onCreate() where View is not yet rendered, trying moving your code to onResume() or even better do like this
mBinding.parentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
}
});
Move your code inside this, it will work.
I want to create my custom camera with supports different color
effects for taking images ... I want to custom color effect on my
camera . i put some effect that is Built_In in device but i have no
idea that how i apply other effect like AFTER SNOW FALLING EFFECT
from here and so many other Color Effects.
Please Give me some hints or any link that is helpful for me
My code for effect is
((ImageView)findViewById(R.id.e1)).setOnClickListener(onButtonClick);
private View.OnClickListener onButtonClick = new View.OnClickListener() {
#Override
public void onClick(View v) {
switch(v.getId())
{
case R.id.e1: MonoEffect();
break;}
}
};
private void MonoEffect()
{
Camera.Parameters parameters =mCamera.getParameters();
parameters.setColorEffect(android.hardware.Camera.Parameters.EFFECT_MONO);
mCamera.setParameters(parameters);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cameraPreviewLayout = (FrameLayout) findViewById(R.id.camera_preview);
//this code is holding an realtime overlay
RelativeLayout layout = (RelativeLayout) findViewById(R.id.preview);
FrameLayout fr = new FrameLayout(this);
fr.setBackgroundResource(R.drawable.snow);
ImageView b1 = new ImageView(this);
b1.setBackgroundResource(R.drawable.snow);
fr.addView(b1);
layout.addView(fr);
/*one solution could be,you if you want a real-time effect on your camera layout,you can add an overlay on the preview as given up.snow is a png format picture with transparent background */ after that... add both the camera output and ta transparent snoweffect as..
Bitmap cameraBitmap =BitmapFactory.decodeByteArray(data, 0, data.length);
Bitmap overlayBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.snow);
Bitmap cameraScaledBitmap = Bitmap.createScaledBitmap(cameraBitmap, 1200, 1600, true);
int wid = cameraScaledBitmap.getWidth();
int hgt = cameraScaledBitmap.getHeight();
Bitmap newImage = Bitmap.createBitmap(wid,hgt, Bitmap.Config.ARGB_8888);
Bitmap overlayScaledBitmap = Bitmap.createScaledBitmap(overlayBitmap, wid, hgt, true);
Canvas canvas = new Canvas(newImage);
canvas.drawBitmap(cameraBitmap , 0, 0, null);
canvas.drawBitmap(overlayScaledBitmap , 0, 0, null);
now you have got your final bitmap as named overlayScaledBitmap.now save it.dont tension about 1200,1600.i just scaled both the camera output bitmap and the snow transparent png as same size.i am currently working on the same project as you qustioned.i would like to take any suggetion from you. https://www.facebook.com/mohammad.mukul.37
I wrote a code that reflects the view of an ImageView in the splash activity. In order to implement this, I took three steps.
Create an ImageView in the layout_splash.xml file and also in the SplashActivity.java.
Call the setImageBitmap method with the reflected ImageView variable
Declare a method that reflects the view of the image.
And here is the code.
public class SplashActivity extends Activity {
private ImageView ivLogo;
private SharedPreferences appPreferences;
private Typeface typeface;
private TextView tvAppName;
private boolean isAppInstalled = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
String appName = getResources().getString(R.string.app_name);
appPreferences = PreferenceManager.getDefaultSharedPreferences(this);
isAppInstalled = appPreferences.getBoolean("isAppInstalled", false);
if(isAppInstalled == false) {
Intent shortcutIntent = new Intent(getApplicationContext(), SplashActivity.class);
shortcutIntent.setAction(Intent.ACTION_MAIN);
Intent intent = new Intent();
intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, appName);
intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.fromContext(getApplicationContext(), R.mipmap.ic_launcher));
intent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
getApplicationContext().sendBroadcast(intent);
SharedPreferences.Editor editor = appPreferences.edit();
editor.putBoolean("isAppInstalled", true);
editor.commit();
}
// Set the app name's font
typeface = Typeface.createFromAsset(getAssets(), "fonts/Catull.ttf");
tvAppName = (TextView) findViewById(R.id.tvAppName);
tvAppName.setTypeface(typeface);
Bitmap originalImage = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_gruppo);
ivLogo = new ImageView(this);
ivLogo.setImageBitmap(getReflection(originalImage));
Handler hd = new Handler();
hd.postDelayed(new Runnable() {
#Override
public void run() {
Intent intent = new Intent(getApplicationContext(), InitialActivity.class);
startActivity(intent);
// Implement the animation on activity change
overridePendingTransition(R.anim.push_down_in, R.anim.push_down_out);
finish();
}
}, 1200);
}
public Bitmap getReflection(Bitmap image) {
// The gap we want between the reflection and the original image
final int reflectionGap = 4;
// Get the bitmap from the mipmap folder
Bitmap originalImage = image;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
// This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
// Create a Bitmap with the flip matrix applied to it.
// We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height / 2, width, height / 2, matrix, false);
// Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Bitmap.Config.ARGB_8888);
// Create a new Canvas with the bitmap that's big enough for
// the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
// Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
//Draw the reflection Image
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
// Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0,
originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
}
But when running the application, I don't see the reflected image but just the plain one. Something wrong with the code?
Problems always occur from the very small things. In here the problem is that the ivLogo variable was not added into the content view. So the ivLogo must be added in the onCreate method like this,
ivLogo = (ImageView) findViewById(R.id.ivLogo);
instead of
ivLogo = new ImageView();
This is java code.I am getting image from image gallery.I have one Button and one ImageView. It is rotating only one time.When I again click button it is not rotating image.
public class EditActivity extends ActionBarActivity
{
private Button rotate;
private ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
rotate=(Button)findViewById(R.id.btn_rotate1);
imageView = (ImageView) findViewById(R.id.selectedImage);
String path = getIntent().getExtras().getString("path");
final Bitmap bitmap = BitmapFactory.decodeFile(path);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setImageBitmap(Bitmap.createScaledBitmap(bitmap, 510, 500,
false));
rotate.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
imageView.setRotation(90);
}
});
}
Change your onClick() method to
#Override
public void onClick(View v)
{
imageView.setRotation(imageView.getRotation() + 90);
}
Notice, what the docs say
Sets the degrees that the view is rotated around the pivot point. Increasing values result in clockwise rotation.
I'd like to update my answer to show how to use RotateAnimation to achieve the same effect in case you're also targeting Android devices running Gingerbread (v10) or below.
private int mCurrRotation = 0; // takes the place of getRotation()
Introduce an instance field to track the rotation degrees as above and use it as:
mCurrRotation %= 360;
float fromRotation = mCurrRotation;
float toRotation = mCurrRotation += 90;
final RotateAnimation rotateAnim = new RotateAnimation(
fromRotation, toRotation, imageview.getWidth()/2, imageView.getHeight()/2);
rotateAnim.setDuration(1000); // Use 0 ms to rotate instantly
rotateAnim.setFillAfter(true); // Must be true or the animation will reset
imageView.startAnimation(rotateAnim);
Usually one can setup such View animations through XML as well. But, since you have to specify absolute degree values in there, successive rotations will repeat themselves instead of building upon the previous one to complete a full circle. Hence, I chose to show how to do it in code above.