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TextView and scale

I use this code
TextView.animate().setDuration(0).scaleX(scale).scaleY(scale).start();
When scale value increase to some point, it make TextView disappear. I dont know why, and how to prevent it?
[Edit] Attach my test code
[test_text_scale.xml] It is Layout xml file for TestTextScale.java
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
android:orientation="vertical">
<TextView
android:id="#+id/tv_test_scale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Test" />
<Button
android:id="#+id/bt_up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toEndOf="#+id/bt_down"
android:layout_toRightOf="#+id/bt_down"
android:text="Up" />
<Button
android:id="#+id/bt_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="Down" />
</RelativeLayout>
[TestTextScale.java]
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class TestTextScale extends AppCompatActivity {
// View
private TextView mTvTestZoom;
private Button mBtUp, mBtDown;
// Model
private int mCurrentScale = 1;
// OnClick listener
private View.OnClickListener mOnClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_up : {
upScale();
setText();
} break;
case R.id.bt_down : {
downScale();
setText();
} break;
}
}
};
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_text_scale);
initView();
initEvent();
}
private void initView() {
mTvTestZoom = (TextView) findViewById(R.id.tv_test_scale);
mBtUp = (Button) findViewById(R.id.bt_up);
mBtDown = (Button) findViewById(R.id.bt_down);
}
private void initEvent() {
mBtDown.setOnClickListener(mOnClickListener);
mBtUp.setOnClickListener(mOnClickListener);
}
private void upScale() {
mCurrentScale += 1;
mTvTestZoom.animate().setDuration(0).scaleX(mCurrentScale).scaleY(mCurrentScale).start();
}
private void downScale() {
mCurrentScale -= 1;
mTvTestZoom.animate().setDuration(0).scaleX(mCurrentScale).scaleY(mCurrentScale).start();
}
private void setText() {
mTvTestZoom.setText(mCurrentScale + "");
}
}

This may happen because the textview exceeds the layout bounds of its parent. To overcome this, simple put android:clipChildren="false" in the xml description of the immediate parent of the textview. You may also need to do it for their parents too.
EDIT:
Upon testing the code myself, I found that the textview did disappear with following log message:
E/OpenGLRenderer: Font size too large to fit in cache. width, height = 635, 1028
This is due to a possible issue in the Android Hardware acceleration modules. One of the ways to avoid this is:
mTvTestZoom.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
This works well and the textView does not disappear after a certain size but, since it disables hardware acceleration for the specific textview, it may lose antialiasing.

Circular layout: Cannot resolve method onCreate(android.os.Bundle)

I want to use CircularLayout in my android app.
I'm getting following error in MainActivity.java file:
cannot resolve method onCreate(android.os.Bundle) even though I have extended AppCompatActivity.
As I need to access methods from both AppCompatActivity and View, I've used nested classes and the error is probably due of that. Not sure how to use that. I'm also the following warning: private inner class Activity is never used. Please let me know to extend two classes. I've found several answers and used them including Extending from two classes and How to extend 2 classes? but none of them seems to work for me. I would like to know what changes can I make in my code for it to work.
This is how my MainActivity.java file looks like:
package com.example.shalini.circlelayout;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private class Activity extends View {
private final static int TOTAL_DEGREE = 360;
private final static int START_DEGREE = -90;
private Paint mPaint;
private RectF mOvalRect = null;
private int mItemCount = 5;
private int mSweepAngle;
private int mInnerRadius;
private int mOuterRadius;
private Bitmap mCenterIcon;
private int[] mColors = {Color.RED, Color.YELLOW, Color.GREEN, Color.BLUE, Color.CYAN};
private String[] mTitles = {"APPT CENTER", "MEDS CABINET", "CHECK-IN", "MY TRACKERS", "MY ACCOUNTS"};
public Activity(Context context) {
this(context, null);
}
public Activity(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public Activity(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStrokeWidth(2);
mSweepAngle = TOTAL_DEGREE / mItemCount;
mInnerRadius = 125;
mOuterRadius = 400;
mCenterIcon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
}
#Override
protected void onDraw(Canvas canvas) {
int width = getWidth();
int height = getHeight();
if (mOvalRect == null) {
mOvalRect = new RectF(width / 2 - mOuterRadius, height / 2 - mOuterRadius, width / 2 + mOuterRadius, height / 2 + mOuterRadius);
}
for (int i = 0; i < mItemCount; i++) {
int startAngle = START_DEGREE + i * mSweepAngle;
mPaint.setColor(mColors[i]);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawArc(mOvalRect, startAngle, mSweepAngle, true, mPaint);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
canvas.drawArc(mOvalRect, startAngle, mSweepAngle, true, mPaint);
int centerX = (int) ((mOuterRadius + mInnerRadius) / 2 * Math.cos(Math.toRadians(startAngle + mSweepAngle / 2)));
int centerY = (int) ((mOuterRadius + mInnerRadius) / 2 * Math.sin(Math.toRadians(startAngle + mSweepAngle / 2)));
canvas.drawBitmap(mCenterIcon, width / 2 + centerX - mCenterIcon.getWidth() / 2, height / 2 + centerY - mCenterIcon.getHeight() / 2, null);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawText(mTitles[i], width / 2 + centerX - mCenterIcon.getWidth() / 2, height / 2 + centerY + mCenterIcon.getHeight(), mPaint);
}
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawCircle(width / 2, height / 2, mInnerRadius, mPaint);
canvas.drawBitmap(mCenterIcon, width / 2 - mCenterIcon.getWidth() / 2, height / 2 - mCenterIcon.getHeight() / 2, null);
super.onDraw(canvas);
}
#Override
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();
}
});
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
And this is my content_main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/lib/com.google.custom"
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=".MainActivity">
<com.example.shalini.circlelayout.MainActivity.Activity
android:id="#+id/pie"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
custom:dividerWidth="5dp"
custom:innerCircle="#drawable/profile_pic_icon"
custom:innerRadius="50dp"
custom:layoutMode="pie"
custom:sliceDivider="#android:color/transparent" >
<RelativeLayout
android:id="#+id/appt_center_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher1" >
<TextView
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/appcenter"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher2" >
<TextView
android:id="#+id/two"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/medscabinet"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher3" >
<TextView
android:id="#+id/three"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/cjeckin"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher4" >
<TextView
android:id="#+id/four"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/mytrackers"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/ic_launcher5" >
<TextView
android:id="#+id/five"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/myaccounts"
android:textStyle="bold" />
</RelativeLayout>
</com.example.shalini.circlelayout.MainActivity.Activity>
</RelativeLayout>

I would like to suggest you to call your subclass of View in a more meaningfully way. In your case
private class Activity extends View {
Regarding onCreate, which is the source of your doubts, you put it inside your View's subclass. Since View has no method called onCreate, the compiler complains about it. The solution is to move the method, and its content in the outer class, the one that extends Activity
your subclass of View is inner and private. I doubt you will be ever able to reference it in your xml

Move Image Left & Right When it Zoomed

How to move image right to left when it zoomed ? I have done zooming on images and now don't know which codes to write for creating movement using finger once it zoomed.
Please have a look at my code and give me your precious reply. Edit my code if possible. Thanks in advance.
MainActivity.java
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.ZoomControls;
public class MainActivity extends Activity {
ImageView img;
ZoomControls zoom;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img = (ImageView) findViewById(R.id.imageView1);
zoom = (ZoomControls) findViewById(R.id.zoomControls1);
zoom.setOnZoomInClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
int w = img.getWidth();
int h = img.getHeight();
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(w + 10, h +10);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
img.setLayoutParams(params);
}
});
zoom.setOnZoomOutClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
int w = img.getWidth();
int h = img.getHeight();
RelativeLayout.LayoutParams params =
new RelativeLayout.LayoutParams(w - 10, h -10);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
img.setLayoutParams(params);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
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" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_launcher" />
<ZoomControls
android:id="#+id/zoomControls1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="50dp" />

Try this library..it easy to implement and works flawlessly
Image Zoom Library

How to zoom second TouchImageView on setOnTouchImageViewListener event of first TouchImageView?

I have two TouchImageView. What I want to do is that, When I zoom in first TouchImageView, second one also get zoom in automatically. And when I swipe from left to right or right to left on first TouchImageView, second one also need to be get swiped automatically but in reverse order. i.e If I swipe first TouchImageView from left to right, second one need to be get swiped automatically right to left. I am using TouchImageView class. My code is below. Thanks in advance.
activity_main.xml
<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:gravity="center"
android:orientation="horizontal"
android:weightSum="2"
tools:context="com.PinchZoom.pinchzoomexampletwo.MainActivity" >
<com.PinchZoom.pinchzoomexampletwo.TouchImageView
android:id="#+id/img_to_be_zoomed"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_weight="1"
android:src="#drawable/fb" >
</com.PinchZoom.pinchzoomexampletwo.TouchImageView>
<com.PinchZoom.pinchzoomexampletwo.TouchImageView
android:id="#+id/img_to_be_zoomed_mirror"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_weight="1"
android:src="#drawable/fb" >
</com.PinchZoom.pinchzoomexampletwo.TouchImageView>
</LinearLayout>
MainActivity.java
package com.PinchZoom.pinchzoomexampletwo;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import com.PinchZoom.pinchzoomexampletwo.TouchImageView.OnTouchImageViewListener;
public class MainActivity extends ActionBarActivity {
TouchImageView img_to_be_zoomed;
TouchImageView img_to_be_zoomed_mirror;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img_to_be_zoomed_mirror = (TouchImageView) findViewById(R.id.img_to_be_zoomed_mirror);
img_to_be_zoomed = (TouchImageView) findViewById(R.id.img_to_be_zoomed);
img_to_be_zoomed
.setOnTouchImageViewListener(new OnTouchImageViewListener() {
#Override
public void onMove() {
img_to_be_zoomed_mirror.setZoom(img_to_be_zoomed
.getCurrentZoom());
img_to_be_zoomed_mirror.setScrollPosition(
img_to_be_zoomed.getScaleX(), 0);
Log.e("Left Img X: ", "" + img_to_be_zoomed.getScaleX());
}
});
}
}
TouchImageView.java
TouchImageView.java Find Here
I have achieved it for Zoom, but not getting for swiping.

Android app crashes after launching intent and using setText() in TextView

I'm trying to launch an activity using intents and setting values in TextViews in the launched activity, but when I try to do that my app crashes. Heres the activity I'm trying to launch. It crashes when i try to set the text in the last two code lines
public class GameOver extends Activity {
TextView correctTxt;
TextView incorrectTxt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
int correct = intent.getIntExtra("correct", 0);
int incorrect = intent.getIntExtra("incorrect", 0);
correctTxt = (TextView)findViewById(R.id.correct_txt);
incorrectTxt = (TextView)findViewById(R.id.incorrect_txt);
correctTxt.setText("" + correct);
incorrectTxt.setText("" + incorrect);
}
}
And the activity that's launching. I make use of the intent in the trueButton onClickListener method:
package com.example.beithia.geotest;
import android.app.Activity;
import java.util.*;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Intent;
public class TestActivity extends Activity {
private Button trueButton;
private Button falseButton;
private TextView questionTextView;
private TextView correctNum;
private TextView incorrectNum;
private TextView avgScore;
int numOfCorrect = 0;
int numOfIncorrect = 0;
double num = 1;
private TrueFalse[] questionBank = new TrueFalse[] {
new TrueFalse(R.string.question_oceans, true),
new TrueFalse(R.string.question_mideast, false),
new TrueFalse(R.string.question_americas, true),
new TrueFalse(R.string.question_asia,true),
new TrueFalse(R.string.question_channel_islands,true),
new TrueFalse(R.string.question_china,false),
new TrueFalse(R.string.question_mexico,true),
new TrueFalse(R.string.question_turkey,false),
new TrueFalse(R.string.question_everest,false),
new TrueFalse(R.string.question_colombia,false),
new TrueFalse(R.string.question_vatican,true),
new TrueFalse(R.string.question_nile,true),
};
private int currentIndex = 0;
private void updateQuestion() {
int question = questionBank[currentIndex].getQuestion();
questionTextView.setText(question);
}
private void checkAnswer(boolean userPressedTrue) {
boolean answerIsTrue = questionBank[currentIndex].isTrueQuestion();
int msgId = 0;
if (userPressedTrue == answerIsTrue) {
msgId = R.string.correct_toast;
numOfCorrect++;
}
else {
msgId = R.string.incorrect_toast;
numOfIncorrect++;
}
Toast.makeText(this,msgId,Toast.LENGTH_SHORT).show();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
questionTextView = (TextView)findViewById(R.id.question_text_view);
correctNum = (TextView)findViewById(R.id.correct_num);
incorrectNum = (TextView)findViewById(R.id.incorrect_num);
avgScore = (TextView)findViewById(R.id.average_score);
trueButton = (Button) findViewById(R.id.true_button);
trueButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
double score = (numOfCorrect / num) * 100;
currentIndex = (currentIndex + 1) % questionBank.length;
correctNum.setText("Correct: " + numOfCorrect);
incorrectNum.setText("Incorrect: " + numOfIncorrect);
avgScore.setText("Score: " + String.format("%.2f", score) + "%");
updateQuestion();
num++;
if(num > 10) {
Intent intent = new Intent(TestActivity.this, GameOver.class);
intent.putExtra("correct", numOfCorrect);
intent.putExtra("incorrect", numOfIncorrect);
startActivity(intent);
}
}
});
falseButton = (Button) findViewById(R.id.false_button);
falseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
double score = (numOfCorrect / num) * 100;
currentIndex = (currentIndex + 1) % questionBank.length;
correctNum.setText("Correct: " + numOfCorrect);
incorrectNum.setText("Incorrect: " + numOfIncorrect);
avgScore.setText("Score: " + String.format("%.2f", score) + "%");
updateQuestion();
num++;
}
});
updateQuestion();
}
}
Here's the layout for activity_main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="#+id/correct_num"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ff00ff12" />
<TextView
android:id="#+id/incorrect_num"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffff5440" />
<TextView
android:id="#+id/average_score"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffff8c1a" />
<TextView
android:id="#+id/question_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="#+id/true_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/true_button"/>
<Button
android:id="#+id/false_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/false_button"/>
</LinearLayout>
</LinearLayout>
And the layout for the activity_game_over.xml:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="#+id/correct_txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/incorrect_txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
I can get it to work if I use the setContentView(R.layout.activity_game_over);
however when I try to launch the main activity again it starts the GameOver Activity, but it should start the GeoQuiz activity instead.

In the GameOver activity you don't set any content view setContentView(), hence you textViews cannot be found, findViewById returns null, hence you get NullPointerException when invoking setText().

I can get it to work if I use the setContentView(R.layout.activity_game_over); however when I try to launch the main activity again it starts the GameOver Activity, but it should start the GeoQuiz activity instead. Please help!
The activity that runs at start up is defined in the android manifest xml file of your project.
look for
action android:name="android.intent.action.MAIN"