Question

我从未参与过ndk。但是我有一个使用ndk的项目。

它给了我java.lang.UnsatisfiedLinkError: Native method not found:

我试图在Google上搜索。我有很多链接但所有都与jni.cpp文件有关但我的错误是在java文件中。所以我无法找到如何纠正它。

"java.lang.UnsatisfiedLinkError: Native method not found: il.co.telavivapp2u.onceapponatime.SharedResources.ocvBitmapPreMultAlpha:(Landroi‌‌d/graphics/Bitmap;Landroid/graphics/Bitmap;)

我在this link之后整合了NDK。该项目由另一位开发人员完成我们正在添加更多功能。这部分由前面的开发人员完成。

我刚添加了Google Search API活动和图库图片活动，它将在网格上显示图片。之前的开发人员已将一些图像放在可绘制文件夹中并将其显示在图库视图中。无论他在最后做什么，它都能完美地运转。即使现在也。但是我添加了同样的事情并没有发生

点击应用可绘制图库视图上的图像后，它将进入相机活动，该活动将以所选图像作为背景捕获图像。然后我们可以编辑并保存该图像。但是在移动图库和谷歌搜索图像捕获应用程序的情况下转为ANR。

我已将NDK路径和变量设置为eclipse，我也安装了c c ++插件

同时控制台正在显示

Cannot run program "\ndk-build.cmd": Launching failed .

我无法理解我犯错误的地方。请帮帮我。

JNI FILE

ANR发生在第207行。

这是我的代码：

package il.co.telavivapp2u.onceapponatime;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Point;
import android.os.Environment;
import android.util.Log;
import android.view.Display;

public class SharedResources {
    public static Bitmap bmpOld = null;
    public static Bitmap bmpOldScaled = null;
    public static Bitmap bmpNew = null;
    public static Bitmap bmpNewScaled = null;

    public static int scaledX = 0, scaledY = 0;
    public static int dispX = 0, dispY = 0;
    public static int fullX = 0, fullY = 0;
    public static int picX = 0, picY = 0;

    public static String fileDir = "/OnceAppOnATime/";
    public static String fileTempDir = fileDir + "/.temp/";
    public static String fileTempNew = fileTempDir + "/temp-new.jpg";
    public static String fileTempOld = fileTempDir + "/temp-old.jpg";
    public static String fileTempMask = fileTempDir + "/temp-mask.jpg";
    public static String fileTempBlend = fileTempDir + "/temp-blend.jpg";
    public static String fileTempRetouch = fileTempDir + "/temp-retouch.jpg";
    //public static String fileLastBlend = "";

    public static BitmapFactory.Options op = new BitmapFactory.Options();

    public static Locale localeHebrew = null;

    public static int taskID = -1;

    public static boolean Init(Activity activity) { return Init(activity, false); }
    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    public static boolean Init(Activity activity, boolean force) {
        if (dispX > 0 && dispY > 0) { // Don't re-init to avoid wrong file names
            if (!force)
                return false; 
        } else {
            fileDir = Environment.getExternalStorageDirectory() + fileDir;
            fileTempDir = Environment.getExternalStorageDirectory() + fileTempDir;
            fileTempNew = Environment.getExternalStorageDirectory() + fileTempNew;
            fileTempOld = Environment.getExternalStorageDirectory() + fileTempOld;
            fileTempMask = Environment.getExternalStorageDirectory() + fileTempMask;
            fileTempBlend = Environment.getExternalStorageDirectory() + fileTempBlend;
            fileTempRetouch = Environment.getExternalStorageDirectory() + fileTempRetouch;
        }

        taskID = activity.getTaskId();

        // Find Hebrew locale, if available
        Locale availableLocales[] = Locale.getAvailableLocales();
        for (int i = 0; i < availableLocales.length; ++i) {
            String lang = availableLocales[i].getLanguage();
            if (lang.equals("he") || lang.equals("iw")) {
                localeHebrew = availableLocales[i];
                break;
            }
        }

        op.inPreferredConfig = Bitmap.Config.ARGB_8888;
        //op.inScaled = false; // Not needed if loading bitmaps from drawable-nodpi
        op.inMutable = true;

        Display display = activity.getWindowManager().getDefaultDisplay();
        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.HONEYCOMB_MR2) {
            dispX = display.getWidth();
            dispY = display.getHeight();
        } else {
            Point dispSize = new Point();
            display.getSize(dispSize);
            dispX = dispSize.x;
            dispY = dispSize.y;
        }
        Log.w("Display Size", dispX + "x" + dispY);
        //scaledX = dispX / 2; scaledY = dispY / 2;
        scaledX = dispX; scaledY = dispY;

        return true;
    }

    public static void setLocale(Activity activity, Locale locale) {
        // This doesn't work reliably
        Locale.setDefault(locale);
        Configuration config = new Configuration();
        config.locale = locale;
        activity.getBaseContext().getResources().updateConfiguration(config,
            activity.getBaseContext().getResources().getDisplayMetrics());
    }

    public static boolean haveScaling() {
        return (dispX != scaledX || dispY != scaledY);
    }

    public static void SaveTempBitmap(Bitmap bitmap, String filename) {
        try {
            new File(fileTempDir).mkdirs();
            FileOutputStream out = new FileOutputStream(filename);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 98, out);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void RecycleOldBitmaps(boolean full, boolean scaled) {
        if (full && bmpOld != null) {
            bmpOld.recycle();
            bmpOld = null;
        }
        if (scaled && bmpOldScaled != null) {
            bmpOldScaled.recycle();
            bmpOldScaled = null;
        }
    }
    public static void RecycleNewBitmaps(boolean full, boolean scaled) {
        if (full && bmpNew != null) {
            bmpNew.recycle();
            bmpNew = null;
        }
        if (scaled && bmpNewScaled != null) {
            bmpNewScaled.recycle();
            bmpNewScaled = null;
        }
    }

    //                                             0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16
    public static int sample2sample[] = new int[] {1, 1, 2, 2, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 16,
        16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32};
    public static Bitmap LoadScaledBitmap(Context ctx, int resId, float fracX, float fracY) {
        // See: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(ctx.getResources(), resId, opts);
        int imageHeight = opts.outHeight;
        int imageWidth = opts.outWidth;

        float requestX = dispX * fracX, requestY = dispY * fracY;
        opts.inSampleSize = (int)(Math.min(imageWidth / requestX, imageHeight / requestY));
        if (opts.inSampleSize < 0 || opts.inSampleSize > 32) // Sometimes index=2147483647 for some reason...
            opts.inSampleSize = 1;
        opts.inSampleSize = sample2sample[opts.inSampleSize];
        Log.w("Bitmap Decoder", "Samples: " + opts.inSampleSize);

        opts.inPreferredConfig = Bitmap.Config.ARGB_8888;
        //opts.inScaled = false; // Not needed if loading bitmaps from drawable-nodpi
        opts.inMutable = true;
        opts.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(ctx.getResources(), resId, opts);
    }
    public static Bitmap LoadScaledBitmap(String filename, float fracX, float fracY) {
        // See: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filename, opts);
        int imageHeight = opts.outHeight;
        int imageWidth = opts.outWidth;

        float requestX = dispX * fracX, requestY = dispY * fracY;
        opts.inSampleSize = (int)(Math.min(imageWidth / requestX, imageHeight / requestY));
        if (opts.inSampleSize < 0 || opts.inSampleSize > 32) // Sometimes index=2147483647 for some reason...
            opts.inSampleSize = 1;
        opts.inSampleSize = sample2sample[opts.inSampleSize];
        Log.w("Bitmap Decoder", "Samples: " + opts.inSampleSize);

        opts.inPreferredConfig = Bitmap.Config.ARGB_8888;
        //opts.inScaled = false; // Not needed if loading bitmaps from drawable-nodpi
        opts.inMutable = true;
        opts.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(filename, opts);
    }

    public static String FileNameNow() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.ENGLISH);
        return fileDir + sdf.format(new Date()) + ".jpg";
    }

    public static native void ocvBitmapPyramidalBlend(String fNew, String fOld, String fMask, String fBlend, int levels);
    public static String ocvBitmapPyramidalBlendTimed(int levels) {
        String fBlend = fileTempBlend;//FileNameNow();

        long t = System.nanoTime();
        ocvBitmapPyramidalBlend(fileTempNew, fileTempOld, fileTempMask, fBlend, levels);
        long dt = (System.nanoTime() - t) / 1000; // Microseconds
        Log.w("OpenCV", "Blended (pyramidal) bitmaps in " + (dt / 1000.0f) + " ms");

        //fileLastBlend = fBlend;
        return fBlend;
    }

    public static native void ocvBitmapPreMultAlpha(Bitmap bitmapImg, Bitmap bitmapMask);
    public static void ocvBitmapPreMultAlphaTimed(Bitmap bitmapImg, Bitmap bitmapMask) {
        long t = System.nanoTime();
        ocvBitmapPreMultAlpha(bitmapImg, bitmapMask);
        long dt = (System.nanoTime() - t) / 1000; // Microseconds
        Log.i("Native", "Applied premultiplied alpha to bitmap in " + (dt / 1000.0f) + " ms");
    }

    public static native void ocvBitmapContrastSaturationSet(Bitmap bitmapImg);
    public static void ocvBitmapContrastSaturationSetTimed(Bitmap bitmapImg) {
        long t = System.nanoTime();
        ocvBitmapContrastSaturationSet(bitmapImg);
        long dt = (System.nanoTime() - t) / 1000; // Microseconds
        Log.i("Native", "Assigned contrast/saturation bitmap in " + (dt / 1000.0f) + " ms");
    }

    public static native void ocvBitmapContrastSaturationSrc(Bitmap bitmapImg, Bitmap bitmapSrc, float contrast, float saturation);
    public static void ocvBitmapContrastSaturationSrcTimed(Bitmap bitmapImg, Bitmap bitmapSrc, float contrast, float saturation) {
        long t = System.nanoTime();
        ocvBitmapContrastSaturationSrc(bitmapImg, bitmapSrc, contrast, saturation);
        long dt = (System.nanoTime() - t) / 1000; // Microseconds
        Log.i("Native", "Applied contrast/saturation (from src) to bitmap in " + (dt / 1000.0f) + " ms");
    }

    public static native void ocvBitmapContrastSaturation(Bitmap bitmapImg, float contrast, float saturation);
    public static void ocvBitmapContrastSaturationTimed(Bitmap bitmapImg, float contrast, float saturation) {
        long t = System.nanoTime();
        ocvBitmapContrastSaturation(bitmapImg, contrast, saturation);
        long dt = (System.nanoTime() - t) / 1000; // Microseconds
        Log.i("Native", "Applied contrast/saturation to bitmap in " + (dt / 1000.0f) + " ms");
    }

}

另外right click on project - >Android Tools -> Add Native Support

Add Native Support is missing. I have Android Native Development Tools installed. Then also it's missing.

Answer 1

不满意的链接错误是由于java类和c类之间的桥梁断开; java中方法的名称应该与C / c ++类中的方法匹配。虽然编译桥是在Java和c / c ++之间创建的，所以如果方法名称不正确，它就不会响应。示例如下方法名称injava正在关注

public native String Stub(){}

在JNI中应该是相同的，但是您的应用程序包名称+类名+方法名如下所示

JNIEXPORT jstring JNICALL Java_com_packageName_ClassName_MethodName

Answer 2

在新的变量系统中添加正确的NDK路径：例如。：“ ANDROID_NDK = ...”
在项目的属性中的“ C / C ++ Build”中的“ Build command：”中，输入以下变量：$ {ANDROID_NDK} /ndk-build.cmd

Answer 3

关键错误是＆＃34;无法运行程序＆＃34; ndk-build＆＃34;：启动失败＆＃34;。如果没有运行，则.so不会构建，这会导致UnsatisfiedLinkError。首先解决ndk-build问题。

尝试删除最初的＆＃39; \＆＃39;来自＆＃34; \ ndk-build.cmd＆＃34;。当我运行＆＃34; ndk-build.cmd＆＃34;时，它可以工作。

无法运行程序“\ ndk-build.cmd”：启动失败

3 个答案: