Обновлено:
Я разработал TextView с учетом размера для вашего требования.Он уведомляет слушателя об изменении размера текста.Я проверил это, и это работает хорошо.Я надеюсь, что это поможет вам.
SizeAwareTextView.java:
package com.aminography.textapp;
import android.content.Context;
import android.support.v7.widget.AppCompatTextView;
import android.util.AttributeSet;
public class SizeAwareTextView extends AppCompatTextView {
private OnTextSizeChangedListener mOnTextSizeChangedListener;
private float mLastTextSize;
public SizeAwareTextView(Context context) {
super(context);
mLastTextSize = getTextSize();
}
public SizeAwareTextView(Context context, AttributeSet attrs) {
super(context, attrs);
mLastTextSize = getTextSize();
}
public SizeAwareTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mLastTextSize = getTextSize();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mLastTextSize != getTextSize()) {
mLastTextSize = getTextSize();
if (mOnTextSizeChangedListener != null) {
mOnTextSizeChangedListener.onTextSizeChanged(this, mLastTextSize);
}
}
}
public void setOnTextSizeChangedListener(OnTextSizeChangedListener onTextSizeChangedListener) {
mOnTextSizeChangedListener = onTextSizeChangedListener;
}
public interface OnTextSizeChangedListener {
void onTextSizeChanged(SizeAwareTextView view, float textSize);
}
}
MainActivity.java
package com.aminography.textapp;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.TypedValue;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final SizeAwareTextView textView1 = findViewById(R.id.textView1);
final SizeAwareTextView textView2 = findViewById(R.id.textView2);
final SizeAwareTextView textView3 = findViewById(R.id.textView3);
final List<SizeAwareTextView> textViewList = new ArrayList<>();
textViewList.add(textView1);
textViewList.add(textView2);
textViewList.add(textView3);
SizeAwareTextView.OnTextSizeChangedListener onTextSizeChangedListener = new SizeAwareTextView.OnTextSizeChangedListener() {
@SuppressLint("RestrictedApi")
@Override
public void onTextSizeChanged(SizeAwareTextView view, float textSize) {
for (SizeAwareTextView textView : textViewList) {
if (!textView.equals(view) && textView.getTextSize() != view.getTextSize()) {
textView.setAutoSizeTextTypeUniformWithPresetSizes(new int[]{(int) textSize}, TypedValue.COMPLEX_UNIT_PX);
}
}
}
};
for (SizeAwareTextView textView : textViewList) {
textView.setOnTextSizeChangedListener(onTextSizeChangedListener);
}
((EditText) findViewById(R.id.editText)).addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
textView1.setText(editable.toString());
}
});
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:gravity="top"
android:orientation="vertical"
android:padding="16dp"
tools:context=".MainActivity">
<com.aminography.textapp.SizeAwareTextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#DEDEDE"
android:text="Here is the first TextView"
android:textSize="26sp"
app:autoSizeMinTextSize="10sp"
app:autoSizeStepGranularity="0.5sp"
app:autoSizeTextType="uniform" />
<com.aminography.textapp.SizeAwareTextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:background="#DEDEDE"
android:text="Here is the second TextView"
android:textSize="26sp"
app:autoSizeMinTextSize="10sp"
app:autoSizeStepGranularity="0.5sp"
app:autoSizeTextType="uniform" />
<com.aminography.textapp.SizeAwareTextView
android:id="@+id/textView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:background="#DEDEDE"
android:text="Here is the third TextView"
android:textSize="26sp"
app:autoSizeMinTextSize="10sp"
app:autoSizeStepGranularity="0.5sp"
app:autoSizeTextType="uniform" />
<android.support.v7.widget.AppCompatEditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="Here is the first TextView" />
</LinearLayout>
Конечный результат: