本文介紹了圓形背景文本(如 Instagram、ReplacementSpan 無法按要求工作)的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
限時送ChatGPT賬號..
我試圖在下面做一些類似于 Instagram 的事情 -
I was trying to do something similar to Instagram below -
但我想要像 Instagram 這樣的曲線 -
But i want this curves like Instagram -
現在我又遇到了一個問題-當我鍵入時，.文本不會自動轉到下一行，我必須按 return ，就像通常 editText 以固定寬度工作一樣.(簡而言之，multiline 不能與 ReplacementSpan 一起正常工作)
Now i am stuck in one more problem -
When i types,. text does not goes automatically to next line, I have to press return , like normally editText works in fixed width. (In short multiline is not working fine with ReplacementSpan)
下面是我所做的示例代碼 -
Below is sample code for what i have done -
public class EditextActivity extends AppCompatActivity {
EditText edittext;
RoundedBackgroundSpan roundedBackgroundSpan;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.editext_screen);
edittext=(EditText)findViewById(R.id.edittext);
// edittext.setText("Hello My name is Karandeep Atwal.
Hii this is test");
roundedBackgroundSpan= new RoundedBackgroundSpan(Color.RED,Color.WHITE);
edittext.getText().setSpan(roundedBackgroundSpan, 0, edittext.getText().length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
public class RoundedBackgroundSpan extends ReplacementSpan implements LineHeightSpan {
private static final int CORNER_RADIUS = 15;
private static final int PADDING_X = 10;
private int mBackgroundColor;
private int mTextColor;
/**
* @param backgroundColor background color
* @param textColor text color
*/
public RoundedBackgroundSpan(int backgroundColor, int textColor) {
mBackgroundColor = backgroundColor;
mTextColor = textColor;
}
@Override
public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
return (int) (PADDING_X + paint.measureText(text,start, end) + PADDING_X);
}
@Override
public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
float width = paint.measureText(text,start, end);
RectF rect = new RectF(x, top, x + width + 2 * PADDING_X, bottom);
paint.setColor(mBackgroundColor);
canvas.drawRoundRect(rect, CORNER_RADIUS, CORNER_RADIUS, paint);
paint.setColor(mTextColor);
canvas.drawText(text, start, end, x + PADDING_X, y, paint);
}
@Override
public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v, Paint.FontMetricsInt fontMetricsInt) {
}
}
}
下面是我的xml -
Below is my xml -
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_gravity="center"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:padding="5dp"
android:background="@drawable/border"
android:id="@+id/edittext"
android:layout_centerInParent="true"
android:textColor="@android:color/black"
android:gravity="center"
android:hint="hi"
android:singleLine="false"
android:inputType="textMultiLine"
android:textSize="30sp"
android:maxWidth="100dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
以下是我使用 setSpan 鍵入時得到的結果 -
Below is what i am getting when i type using setSpan -
這是我想要的固定寬度的正常行為 -
This is normal behaviour for fixed width, that i want -
推薦答案
activity_main.xml
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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:background="@android:color/holo_purple"
tools:context="com.tttzof.demotext.MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Enter text"
android:textSize="30sp"
android:gravity="center"
android:textColor="@android:color/black"
android:background="@android:color/transparent"
android:layout_gravity="center"/>
</FrameLayout>
MainActivity.java
MainActivity.java
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.Spannable;
import android.text.TextWatcher;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText = (EditText) findViewById(R.id.editText);
int padding = dp(8);
int radius = dp(5);
final Object span = new BackgroundColorSpan(
Color.WHITE,
(float)padding,
(float) radius
);
editText.setShadowLayer(padding, 0f, 0f, 0);
editText.setPadding(padding, padding, padding, padding);
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 s) {
s.setSpan(span, 0, s.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
});
}
private int dp(int value) {
return (int) (getResources().getDisplayMetrics().density * value + 0.5f);
}
}
BackgroundColorSpan.java
BackgroundColorSpan.java
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.text.style.LineBackgroundSpan;
public class BackgroundColorSpan implements LineBackgroundSpan {
private float padding;
private float radius;
private RectF rect = new RectF();
private Paint paint = new Paint();
private Paint paintStroke = new Paint();
private Path path = new Path();
private float prevWidth = -1f;
private float prevLeft = -1f;
private float prevRight = -1f;
private float prevBottom = -1f;
private float prevTop = -1f;
public BackgroundColorSpan(int backgroundColor,
float padding,
float radius) {
this.padding = padding;
this.radius = radius;
paint.setColor(backgroundColor);
//paintStroke.setStyle(Paint.Style.STROKE);
//paintStroke.setStrokeWidth(5f);
paintStroke.setColor(backgroundColor);
}
@Override
public void drawBackground(
final Canvas c,
final Paint p,
final int left,
final int right,
final int top,
final int baseline,
final int bottom,
final CharSequence text,
final int start,
final int end,
final int lnum) {
float width = p.measureText(text, start, end) + 2f * padding;
float shift = (right - width) / 2f;
rect.set(shift, top, right - shift, bottom);
if (lnum == 0) {
c.drawRoundRect(rect, radius, radius, paint);
} else {
path.reset();
float dr = width - prevWidth;
float diff = -Math.signum(dr) * Math.min(2f * radius, Math.abs(dr/2f))/2f;
path.moveTo(
prevLeft, prevBottom - radius
);
path.cubicTo(
prevLeft, prevBottom - radius,
prevLeft, rect.top,
prevLeft + diff, rect.top
);
path.lineTo(
rect.left - diff, rect.top
);
path.cubicTo(
rect.left - diff, rect.top,
rect.left, rect.top,
rect.left, rect.top + radius
);
path.lineTo(
rect.left, rect.bottom - radius
);
path.cubicTo(
rect.left, rect.bottom - radius,
rect.left, rect.bottom,
rect.left + radius, rect.bottom
);
path.lineTo(
rect.right - radius, rect.bottom
);
path.cubicTo(
rect.right - radius, rect.bottom,
rect.right, rect.bottom,
rect.right, rect.bottom - radius
);
path.lineTo(
rect.right, rect.top + radius
);
path.cubicTo(
rect.right, rect.top + radius,
rect.right, rect.top,
rect.right + diff, rect.top
);
path.lineTo(
prevRight - diff, rect.top
);
path.cubicTo(
prevRight - diff, rect.top,
prevRight, rect.top,
prevRight, prevBottom - radius
);
path.cubicTo(
prevRight, prevBottom - radius,
prevRight, prevBottom,
prevRight - radius, prevBottom
);
path.lineTo(
prevLeft + radius, prevBottom
);
path.cubicTo(
prevLeft + radius, prevBottom,
prevLeft, prevBottom,
prevLeft, rect.top - radius
);
c.drawPath(path, paintStroke);
}
prevWidth = width;
prevLeft = rect.left;
prevRight = rect.right;
prevBottom = rect.bottom;
prevTop = rect.top;
}
}
這篇關于圓形背景文本(如 Instagram、ReplacementSpan 無法按要求工作)的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！
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