我尝试以这种方式编写文本,但它不起作用,我不明白我错在哪里。
mImageView.buildDrawingCache();
Bitmap bmap = mImageView.getDrawingCache();
Canvas c = new Canvas (bmap);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Style.FILL);
paint.setTextSize(20);
c.drawText("Some Text", 0, 25, paint);
我尝试了几次,但显示屏无法显示任何文字。我必须确保该图像与书面文本一起保存。谢谢
这是如何在 ImageView 上绘制文本的简单示例:
MainActivity.java
package com.exmple.imagetest;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Bundle;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView mImageView = (ImageView)findViewById(R.id.imageView1);
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.image);
Config config = bm.getConfig();
int width = bm.getWidth();
int height = bm.getHeight();
Bitmap newImage = Bitmap.createBitmap(width, height, config);
Canvas c = new Canvas(newImage);
c.drawBitmap(bm, 0, 0, null);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Style.FILL);
paint.setTextSize(20);
c.drawText("Some Text", 0, 25, paint);
mImageView.setImageBitmap(newImage);
}
}
活动_main.xml
<?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" >
<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/image"
android:contentDescription="@string/image" />
</RelativeLayout>
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