Activity代码使用

shareWechatFriend(MainActivity.this, "这里是分享的内容");

方法shareWechatFriend(Context context, String content)

    //分享纯文本到微信
    /**
     * Context context
     * 分享的内容 content
     */
    public void shareWechatFriend(Context context, String content) {
        if (PlatformUtil.isInstallApp(context, PlatformUtil.PACKAGE_WECHAT)) {
            Intent intent = new Intent();
            ComponentName cop = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareImgUI");
            intent.setComponent(cop);
            intent.setAction(Intent.ACTION_SEND);
            intent.putExtra("android.intent.extra.TEXT", content);
            intent.putExtra("Kdescription", !TextUtils.isEmpty(content) ? content : "");
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        } else {
            ToastUtil.getInstance()._short(context, "您需要安装微信客户端");
        }
    }

分享图片就用项目中用到的分享二维码功能

生成二维码要一定导入zxing
zxing的GitHub地址：https://github.com/zxing/zxing

implementation 'com.google.zxing:core:3.2.1'

Activity代码使用


Uri uri = Uri.parse(MediaStore.Images.Media.insertImage(getContentResolver(), 
QRcodeUtil.createQRCodeBitmap"二维码中的内容", 400, 400, "UTF-8", "L", "1", Color.BLACK, Color.WHITE), null, null));
shareWechatFriend(MainActivity.this, uri);

方法shareWechatFriend(Context context, Uri uri)

     //分享图片到微信
    /**
     * Context context
     * 图片 uri
     */
    public static void shareWechatFriend(Context context, Uri uri) {
        if (PlatformUtil.isInstallApp(context, PlatformUtil.PACKAGE_WECHAT)) {
            Intent intent = new Intent();
            ComponentName cop = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.tools.ShareImgUI");
            intent.setComponent(cop);
            intent.setAction(Intent.ACTION_SEND);
            intent.setType("image/*");
            intent.putExtra(Intent.EXTRA_STREAM, uri);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(Intent.createChooser(intent, "Share"));
        } else {
            ToastUtil.getInstance()._short(context, "您需要安装微信客户端");
        }
    }

PlatformUtil

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

import java.util.List;

public class PlatformUtil {
    public static final String PACKAGE_WECHAT = "com.tencent.mm";
    public static final String PACKAGE_MOBILE_QQ = "com.tencent.mobileqq";
    public static final String PACKAGE_SINA = "com.sina.weibo";

    // 判断是否安装指定app
    public static boolean isInstallApp(Context context, String app_package){
        final PackageManager packageManager = context.getPackageManager();
        List<PackageInfo> pInfo = packageManager.getInstalledPackages(0);
        if (pInfo != null) {
            for (int i = 0; i < pInfo.size(); i++) {
                String pn = pInfo.get(i).packageName;
                if (app_package.equals(pn)) {
                    return true;
                }
            }
        }
        return false;
    }
}

QRcodeUtil

import android.graphics.Bitmap;
import android.text.TextUtils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

public class QRcodeUtil {
    public static Bitmap createQRCodeBitmap(String content, int width, int height,
                                            String character_set, String error_correction_level,
                                            String margin, int color_black, int color_white) {
        // 字符串内容判空
        if (TextUtils.isEmpty(content)) {
            return null;
        }
        if (width =< 0 || height =< 0) {
            return null;
        }
        try {
            /** 1.设置二维码相关配置 */
            Hashtable<EncodeHintType, String> hints = new Hashtable<>();
            // 字符转码格式设置
            if (!TextUtils.isEmpty(character_set)) {
                hints.put(EncodeHintType.CHARACTER_SET, character_set);
            }
            // 容错率设置
            if (!TextUtils.isEmpty(error_correction_level)) {
                hints.put(EncodeHintType.ERROR_CORRECTION, error_correction_level);
            }
            // 空白边距设置
            if (!TextUtils.isEmpty(margin)) {
                hints.put(EncodeHintType.MARGIN, margin);
            }
            /** 2.将配置参数传入到QRCodeWriter的encode方法生成BitMatrix(位矩阵)对象 */
            BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);

            /** 3.创建像素数组,并根据BitMatrix(位矩阵)对象为数组元素赋颜色值 */
            int[] pixels = new int[width * height];
            for (int y = 0; y < height; y++) {
                for (int x = 0; x < width; x++) {
                    //bitMatrix.get(x,y)方法返回true是黑色色块，false是白色色块
                    if (bitMatrix.get(x, y)) {
                        pixels[y * width + x] = color_black;//黑色色块像素设置
                    } else {
                        pixels[y * width + x] = color_white;// 白色色块像素设置
                    }
                }
            }
            /** 4.创建Bitmap对象,根据像素数组设置Bitmap每个像素点的颜色值,并返回Bitmap对象 */
            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            return bitmap;
        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        }
    }
}