实现支付宝个人收钱页面二维码图片保存功能，效果如下：
支付宝图片.jpg
思路
创建内容视图布局文件，将视图生成图片，然后再保存到图库中。
核心代码：
- 布局文件(qrcode_page.xml)：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#029FE8">
<ImageView
android:id="@+id/logoImageView"
android:layout_width="match_parent"
android:layout_height="130dp"
android:background="@android:color/white"
android:scaleType="centerInside"
android:src="@mipmap/alipay_logo_black"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="打开支付宝[扫一扫]"
android:textColor="@android:color/white"
android:textSize="26sp"
app:layout_constraintBottom_toTopOf="@id/qrcodeImageView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/logoImageView"
app:layout_constraintVertical_bias="0.7" />
<ImageView
android:id="@+id/qrcodeImageView"
android:layout_width="@dimen/qrcode_size"
android:layout_height="@dimen/qrcode_size"
android:background="#FFFFFF"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/logoImageView" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="免费寄送收钱码：拨打95188-6"
android:textColor="@android:color/white"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/qrcodeImageView"
app:layout_constraintVertical_bias="0.7" />
</android.support.constraint.ConstraintLayout>
- 生成页面并保存至图库
private void saveQrcodeToGallery() {
//创建视图
View qrcodeView = getLayoutInflater().inflate(R.layout.qrcode_page, null, false);
((ImageView)qrcodeView.findViewById(R.id.qrcodeImageView)).setImageDrawable(qrcodeImageView.getDrawable());
//计算视图大小
DisplayMetrics displayMetrics = SystemUtils.getWindowDisplayMetrics(mContext);
final int width = displayMetrics.widthPixels;
final int height = displayMetrics.heightPixels - SystemUtils.getStatusBarHeight(mContext) - SystemUtils.getActionBarHeight(mContext) - getResources().getDimensionPixelSize(R.dimen.default_bottom_bar_height);
//将视图生成图片
Bitmap image = SystemUtils.generateImageFromView(qrcodeView, width, height);
//将图片保存到系统相册
boolean isSuccess = SystemUtils.saveImageToGallery(MainActivity.this, image);
image.recycle();
if (isSuccess) {
Toast.makeText(MainActivity.this, "已保存到系统相册！", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "保存到系统相册失败！", Toast.LENGTH_SHORT).show();
}
}
- SystemUtils.java的实现
package org.hjb.saveqrcodedemo;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* Created by hejunbin on 2018/1/19.
*/
public class SystemUtils {
public static int getStatusBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
} else {
result = context.getResources().getDimensionPixelSize(R.dimen.default_status_bar_height);
}
return result;
}
public static DisplayMetrics getWindowDisplayMetrics(Context context) {
WindowManager wm = (android.view.WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics displayMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics;
}
public static int getActionBarHeight(Context context) {
int[] attrs = {android.R.attr.actionBarSize};
TypedArray values = context.getTheme().obtainStyledAttributes(attrs);
int actionBarHeight = values.getDimensionPixelSize(0, 0);
values.recycle();
if (actionBarHeight <= 0) {
actionBarHeight = context.getResources().getDimensionPixelSize(R.dimen.default_action_bar_height);
}
return actionBarHeight;
}
public static Bitmap generateImageFromView(View view, int width, int height) {
view.setDrawingCacheEnabled(true);
view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
view.measure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY));
view.layout(0, 0, width, height);
Bitmap image = Bitmap.createBitmap(view.getDrawingCache());
view.destroyDrawingCache();
return image;
}
/**
* 将图片保存到系统相册
*
* @param context
* @param bmp
* @return
*/
public static boolean saveImageToGallery(Context context, Bitmap bmp) {
String galleryPath = Environment.getExternalStorageDirectory() + File.separator + Environment.DIRECTORY_PICTURES;
File galleryDir = new File(galleryPath);
if (!galleryDir.exists()) {
galleryDir.mkdirs();
}
String fileName = System.currentTimeMillis() + ".jpg";
File file = new File(galleryPath, fileName);
FileOutputStream fos = null;
boolean isSuccess = false;
try {
fos = new FileOutputStream(file);
isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
//保存图片后发送广播通知更新数据库
Uri uri = Uri.fromFile(file);
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fos != null)
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return isSuccess;
}
}
- 二维码的生成采用三方库AwesomeQRCode实现，代码如下：
new AwesomeQRCode.Renderer()
.contents("HTTPS://QR.ALIPAY.COM/FKX08887CNJJPX3EOUGF7B")
.size(getResources().getDimensionPixelSize(R.dimen.qrcode_size))//二维码的大小
.margin(getResources().getDimensionPixelSize(R.dimen.qrcode_size_margin))//二维码边距即留白大小
.dotScale(1)//点的伸缩比例
.logoRadius(getResources().getDimensionPixelOffset(R.dimen.qrcode_size_logo_radius))//中心logo圆角大小
.logo(BitmapFactory.decodeResource(getResources(), R.mipmap.icon))//中心logo
.logoScale(0.25F)//logo占二维码的比例
.renderAsync(new AwesomeQRCode.Callback() {
@Override
public void onRendered(AwesomeQRCode.Renderer renderer, final Bitmap bitmap) {
runOnUiThread(new Runnable() {
@Override
public void run() {
qrcodeImageView.setImageBitmap(bitmap);
}
});
}
@Override
public void onError(AwesomeQRCode.Renderer renderer, Exception e) {
e.printStackTrace();
}
});
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