Develop Reference

How to fix blurry imageView in Android app?

I have an activity, which only has an image. Which is way too blurry. How do I fix its blur and get it back sharp? I have not added any special things to it. And I actually want the image to cover at least half the screen. It is just the image which has become blurred and I can't figure out how to fix it since 5 hours.
My SorryAnim.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0C090A"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.dhairyadev.sorry.SorryAnim" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:scale="centerCrop"
android:src="#drawable/pls" />
My SorryAnim.java:
package com.dhairyadev.sorry;
import android.app.Activity;
import android.content.Intent;
import android.media.Image;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
public class SorryAnim extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sorry_anim);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.sorry_anim, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case R.id.about_dev:
Intent intent = new Intent (getApplicationContext(), AboutDev.class);
startActivity (intent);
}
return false;
}
}
Looking for helpful answer ASAP. :)

The only thing that may make it blure is that you are stretching it to match_parent
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
Or the image is assets is just blurred.
Try to remove the scaling and see if it is changing anything.

Your ImageView height and width are set to match_parent. Unless your drawable happens to be exactly the size of the screen, it will be stretched, i.e. interpolated. Try changing height and width to wrap_content to see the image in it's original form.

Missing button while executing first official Android tutorial

I am following official Android tutorial, but when I start the application, I obtain
instead of getting
Hereunder main files of the sample project
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send" />
</LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">AndroidTest</string>
<string name="edit_message">Enter a message</string>
<string name="button_send">Send</string>
<string name="action_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
</resources>
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.androidtest.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/edit_message" />
</RelativeLayout>
MainActivity.java
package com.example.androidtest;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
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();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
System details:
Fedora 20;
Android 4.4.4;
Eclipse 4.4;
ADB

I think you never attach the fragment into the activity.
Try to copy the fragment_main.xml into activity_main.xml!

The problem is that you have to add the fragment to the main activity.
There you can see how:
http://developer.android.com/training/basics/fragments/creating.html
You must add to your main activity layout, in the place where you want to place fragment.
<fragment android:name="com.example.android.MainFragment"
android:id="#+id/article_fragment"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
Then you had to create the class of the fragment, and inflate the main activity with the main layout

Button not showing up on screen Android Application

I have created an application where users can send and share text that they have input, if they click the send button, the text that they input will be displayed, if they click the share button, the application opens up a list of sharing methods (GMail, Messaging etc..), what I want is though, to allow the users to view there text and then share it, hwoever, when the user clicks send and it goes to the file activity_display, the text shows, but the button does not. Any ideas why? Could you fix this? Here's the code;
activity_display_message.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".DisplayMessageActivity" >
<TextView
android:id="#+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="shareMessage"
android:layout_below="#+id/text_view"
android:text="test" />
</RelativeLayout>
MAIN PROBLEM: Button Share does not show.
EDIT: I suspect I may need to include something to this file, here's the code, any help?
DisplayMessageActivity.java:
package com.example.myfirstapp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.support.v4.app.NavUtils;
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
public class DisplayMessageActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(20);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView);
}
/**
* Set up the {#link android.app.ActionBar}, if the API is available.
*/
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.display_message, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}

Since you are using RelativeLayout you need to specify where to layout your views. Try this for example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".DisplayMessageActivity" >
<TextView
android:id="#+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="shareMessage"
android:layout_below="#+id/text_view"
android:text="test" />

you are using relative layout. use linear layout instead. this will solve your problem.

You are using a relative layout. The objects are overlapping because you have not set them up to be LeftOf or Below or something like that.

Just replace your button with:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:onClick="shareMessage"
android:text="#string/button_share" />
And TextView with this:
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />

Android - Show image from res/drawable onClick

First of all, I wanna say I've been seeking for an answer on the Forum and I found didn't match for what I wanted. Basically, what I want is: when the user clicks on one of the images previously "specified" on the .xml file, a new image is displayed on the center of the screen that is not "specified" on the .xml file. I wrote "specified" cause idk if it's the correct way to refer to this.
EDIT: there was no need to not specify the image previously, all I needed was to set "gone" for visibiity. This code is working exactly how I wanted (ty guys):
Main.java
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;
public class Principal extends Activity {
ImageView cuia1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_principal);
cuia1 = (ImageView) findViewById(R.id.cuia1);
cuia1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
ImageView cuia1grande = (ImageView) findViewById(R.id.cuia1grande);
cuia1grande.setVisibility(1);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.principal, menu);
return true;
}
}
activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableLayout
android:id="#+id/tableLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:shrinkColumns="*"
android:stretchColumns="*">
<TableRow
android:id="#+id/tabelaCuias"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<TextView
android:id="#+id/selecionaCuia"
android:text="Selecione a cuia"
android:textStyle="bold">
</TextView>
<ImageView
android:id="#+id/cuia1"
android:src="#drawable/cuia1">
</ImageView>
<ImageView
android:id="#+id/cuia2"
android:src="#drawable/cuia2">
</ImageView>
<ImageView
android:id="#+id/cuia3"
android:src="#drawable/cuia3">
</ImageView>
<ImageView
android:id="#+id/cuia4"
android:src="#drawable/cuia4">
</ImageView>
</TableRow>
</TableLayout>
<ImageView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_centerInParent="true"
android:visibility="gone"
android:id="#+id/cuia1grande"
android:src="#drawable/cuia1grande">
</ImageView>

Is there any reason you don't want to "specify" the image in your layout file? You could place it there and not display it (visibilty="gone"), and then show/hide it when you deem fit.
Here's what I'd do:
Make your layout a RelativeLayout instead of a TableLayout (this will make things easier for showing the image in the center)
Place your TableLayout within the wrapping RelativeLayout
Define an ImageView as the last child within the wrapping RelativeLayout, set centerInParent="true", visibilty="gone"
In your onClick method, simply set its visibility as visible.
If you really don't want to define the ImageView in the layout, then you can create it programmatically:
Follow the same steps 1-2 as before
Capture the reference to the wrapping RelativeLayout in the code
In the onClick method, create the ImageView programatically, specifying the centerInParent="true" via the code (let me know if you want an example on how to do this & I'll edit the answer with a code sample).
Add the new view to the RelativeLayout via myRelativeLayout.addView(myImageView);
Hope this helps :)

public class Principal extends Activity {
ImageView cuia1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_principal);
cuia1 = (ImageView) findViewById(R.id.cuia1);
//set invisible
cuia1 .setVisibility(View.INVISIBLE);
cuia1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//show image on the center of screen
//set image
cuia1.setImageResource(R.drawable.cuia1);
// set visible
cuia1 .setVisibility(View.VISIBLE);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.principal, menu);
return true;
}
}
import import android.view.View;
Cheerz!

findViewById still return null (newbie)

Hello, i'm new to the android(also java) so i try to create some easy app. This app will have one base layout from xml and the dynamic layout which will be create from code and will be insert into that base layout. But when i use the findViewbyId it won't work, it return as null.
After that i try to insert "setContentView" before trying findViewbyId and also clean project... and it still got NULL ..
Here are my code..
package com.app.something;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.GridLayout;
import android.widget.GridView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
LinearLayout lLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_main);
GridLayout grid = new GridLayout(this);
grid.setColumnCount(5);
for (int i = 0;i<20;i++){
ImageButton ib = new ImageButton(this);
ib.setImageResource(R.drawable.ic_launcher);
ib.setId(i+1);
final int index = i;
ib.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.i("TAG","The index is" + index);
}
});
grid.addView(ib);
}
lLayout = (LinearLayout)findViewById(R.layout.activity_main);
if(lLayout == null)Log.i("TAG", "It said, NULLL");
else {
lLayout.addView(grid);
setContentView(lLayout);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
and this is the base layout activity_main (blank)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#ffffff00"
tools:context=".MainActivity" >
</RelativeLayout>

Firt you are trying to cast a RelativeLayout to a LinearLayout. Second you missed the id attribute for your LinearLayout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#ffffff00"
android:id="#+id/myId"
tools:context=".MainActivity" >
</LinearLayout>
after fix that you can retrieve your layout this way:
lLayout = (LinearLayout)findViewById(R.id.myId);

change
lLayout = (LinearLayout)findViewById(R.layout.activity_main);
to
RelativeLayout lLayout = (RelativeLayout)findViewById(R.id.activity_main);
because activity_main layout conatin RelativeLayout layout as root View instead of LinearLayout and you also need to define android:id for RelativeLayout layout.
or you can do it as using LayoutInflater :
View lLayout = getLayoutInflater().inflate(R.layout.activity_main);
if(lLayout == null)
Log.i("TAG", "It said, NULLL");
else {
lLayout.addView(grid);
setContentView(lLayout);
}

lLayout = (LinearLayout)findViewById(R.layout.activity_main);
1.you have to pass ID for that view, add android:id attribute to relative layout.
2.you dont have any linear layout in your code
3.you have a relative layout cast this to RelativeLayout

you can not use
lLayout = (LinearLayout)findViewById(R.layout.activity_main);
as per the method name it finds the view By id of the view, not the resource id like you are using. you can access a view by an id that is set by using
android:id="#+id/someid"
then from code
lLayout = (LinearLayout)findViewById(R.id.someid);

findViewById searches in your layout, so e.g.:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/layout_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#ffffff00"
tools:context=".MainActivity" >
</RelativeLayout>
The you can use it:
(RelativeLayout) findViewById(R.id.layout_main);