I've written a subclass of EditText. Here is that subclass:
package com.package.foo;
import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.EditText;
public class FuturaEditText extends EditText{
public FuturaEditText(Context context) {
this(context, null, 0);
}
public FuturaEditText(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FuturaEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(!isInEditMode()) {
setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/futura.ttf"));
}
}
}
yet it doesn't behave like an EditText, but a TextView. In particular, the soft keyboard isn't rising on focus and it has no EditText formatting. Why?
For completeness - from the source:
public EditText(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.editTextStyle);
}
So, if the constructor is called with no default style, it defaults to editTextStyle
This implementation, with each constructor calling the matched super constructor:
package com.package.foo;
import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.EditText;
public class FuturaEditText extends EditText{
public FuturaEditText(Context context) {
super(context);
if(!isInEditMode()) {
setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/futura.ttf"));
}
}
public FuturaEditText(Context context, AttributeSet attrs) {
super(context, attrs);
if(!isInEditMode()) {
setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/futura.ttf"));
}
}
public FuturaEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(!isInEditMode()) {
setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/futura.ttf"));
}
}
}
works. I can only assume that EditText(context, attrs, 0) is not the same as EditText(context, attrs).
You should not invoke the super constructor completing the missing arguments, otherwise there's no way for a client to invoke a constructor with less than 3 arguments (i.e. super.(Context context, AttributeSet attrs)).
The second version is the correct one.
Related
I'm creating a settings screen, and I have a few settings items:
SwitchPreferenceCompat and my CustomPreference.
I need the СustomPreference to disappear(hide) when the SwitchPreferenceCompat is turned off and appear(show) when the SwitchPreferenceCompat is turned on.
Out of the box, only the "dependency" mechanism is available by specifying the "dependency" attribute for some Preferences, which only disables/enables items, and I need to change visibility.
Is there a way to achieve this?
create customPreference and override onDependencyChanged().
package com.paul.ttcapp.p9988030.helper.ui;
import android.content.Context;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.preference.EditTextPreference;
import androidx.preference.Preference;
public class PaulEditTextPreference extends EditTextPreference {
public PaulEditTextPreference(#NonNull Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
public PaulEditTextPreference(#NonNull Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public PaulEditTextPreference(#NonNull Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public PaulEditTextPreference(#NonNull Context context) {
super(context);
}
#Override
public void onDependencyChanged(#NonNull Preference dependency, boolean disableDependent) {
// If the corresponding dependency is disabled, disable (hide) this setting as well.
setVisible(!disableDependent);
super.onDependencyChanged(dependency, disableDependent);
}
}
Following is my custom TextView Class:
public class MontTextView extends android.support.v7.widget.AppCompatTextView{
public MontTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public MontTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MontTextView(Context context) {
super(context);
init();
}
public void init() {
Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Montserrat-Regular.ttf");
setTypeface(tf ,1);
}
}
And in XML I use it like this:
<com.minimalist.gorakh.customviews.MontTextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/_20sdp"
android:text="Text"
android:textColor="#fff"
android:textSize="#dimen/_25ssp"
app:layout_constraintBottom_toBottomOf="#+id/betaView"
app:layout_constraintStart_toStartOf="#+id/betaView"
app:layout_constraintTop_toTopOf="#+id/betaView" />
This is working in pre-lollipop(v-19) like this:
And on a marshmallow emulator:
I copied the custom TextView code from a previous project, but couldn't get what am I doing wrong here.
Try this :
import android.widget.*;
import android.util.*;
import android.content.*;
import android.graphics.*;
public class MontTextView extends TextView{
public MontTextView (Context context) {
super(context);
init();
}
public MontTextView (Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MontTextView (Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
setTypeface(Typeface.createFromAsset(getContext().getAssets(), "fonts/Montserrat-Regular.ttf"));
}
}
I am trying to create a todo list app. I am adding entered text to the listitems on the enter, it's working fine without the style.
After adding style with paint and drawing its giving null pointer exception. I am initializing all the drawing and paint objects in the init method of "ToDoListItemView". I tried with "log.i" but it's not entering into ToDoListItemView's init method.
Here is my code.
MainActivity:
package todo.prac.com.todolist;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView mylistView=(ListView)findViewById(R.id.myListView);
final EditText editText=(EditText)findViewById(R.id.myEditText);
final ArrayList<String>todoItems=new ArrayList<String>();
final ArrayAdapter<String>adapter;
adapter=new ArrayAdapter<String>(this,R.layout.todolist_view,todoItems);
mylistView.setAdapter(adapter);
editText.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View view, int i, KeyEvent keyEvent) {
if(keyEvent.getAction()==KeyEvent.ACTION_DOWN){
if(i==KeyEvent.KEYCODE_ENTER){
todoItems.add(0,editText.getText().toString());
adapter.notifyDataSetChanged();
editText.setText("");
return true;
}
}
return false;
}
});
}
}
and my ToDoListItemView
package todo.prac.com.todolist;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
public class ToDoListItemView extends TextView {
private Paint marginPaint;
private Paint linePaint;
private int paperColor;
private float margin;
public ToDoListItemView(Context context) {
super(context);
}
public ToDoListItemView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ToDoListItemView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public ToDoListItemView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
private void init(){
Log.i("init","inside");
Resources myResources=getResources();
marginPaint=new Paint(Paint.ANTI_ALIAS_FLAG);
linePaint=new Paint(Paint.ANTI_ALIAS_FLAG);
marginPaint.setColor(myResources.getColor(R.color.notepad_margin));
linePaint.setColor(myResources.getColor(R.color.notepad_line));
paperColor=myResources.getColor(R.color.notepad_paper);
margin=myResources.getDimension(R.dimen.notepad_margin);
}
#Override
public void onDraw(Canvas canvas){
canvas.drawColor(paperColor);
if(linePaint==null){
Log.i("linepaint","is null");
}
canvas.drawLine(0,0,getMeasuredHeight(),0,linePaint);
canvas.drawLine(0,getMeasuredHeight(),getMeasuredWidth(),getMeasuredHeight(),linePaint);
canvas.drawLine(margin,0,margin,getMeasuredHeight(),marginPaint);
canvas.save();
canvas.translate(margin,0);
super.onDraw(canvas);
canvas.restore();
}
}
and my TodoList layout xml:
<?xml version="1.0" encoding="utf-8"?>
<todo.prac.com.todolist.ToDoListItemView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:padding="10dp"
android:scrollbars="vertical"
android:textColor="#color/notepad_text"
android:fadingEdge="vertical"
/>
You are not calling the init() method inside the constructors of your class.
public ToDoListItemView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ToDoListItemView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public ToDoListItemView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init();
}
I solve this problem by this method.
public ToDoListItemView(Context context) {
this(context,null);
}
public ToDoListItemView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public ToDoListItemView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// initiate your some things
}
Pay attention to: only one super. others in place of this .
I need to set my shape as default background for all of my texts and I don't know how to do this, I want to add many TextView to my project so it's really important for me to do this, I've tried searching the internet but no luck :(
try this code
import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;
public class CustomTextView extends TextView{
public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public CustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomTextView(Context context) {
super(context);
init();
}
public void init() {
if(!isInEditMode()){
setBackgroundResource("Your shape file id ");// like r.drawable.shape_textview
}
}
}
I have a problem with creating custom view. Here is code:
package com.example.App;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
public class v extends View {
public v(Context context) {
super(context);
}
public v(Context context, AttributeSet attrs) {
super(context, attrs);
}
public v(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
}
I'm trying to use it in layout and getting render error(NullPointerException), here is what IDEA has jenerate in layout code:
<view android:layout_width="wrap_content"
android:layout_height="wrap_content"
class="com.example.App.v" android:id="#+id/view" android:layout_gravity="center"/>
What I'm doing wrong? How to fix it?