无法运行程序"\ndk-build.cmd"：启动失败

Question

我从来没有在ndk工作过。但是我有一个使用ndk的项目。

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

我试着在谷歌上搜索。我得到了许多链接，但都与jni.cpp文件相关，但我的错误在java文件中。所以我找不到怎么改正它。

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

我按照此链接集成了NDK。这个项目是由另一个开发人员完成的，我们在其中添加了更多的功能。此部分由前一个开发人员完成。

我刚刚添加了活动和图片库图像活动，它们将显示网格上的图像。以前的开发已经将一些图像放在可绘制文件夹中，并将其显示在图片库视图中。不管他到底做了什么它都跑得很好。即使现在也是。但我补充说，同样的事情并没有发生

单击应用程序绘图库视图上的图像后，它将转到相机活动中，该活动将以选定的图像作为背景捕获图像。然后我们可以编辑和保存这个图像。但在移动画廊和谷歌搜索图像后，捕获应用程序去ANR。

我已经将NDK路径和变量设置为eclipse，我还安装了c c++插件。

控制台也显示

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

我不明白我在哪里出了错。请帮帮我。

JNI文件

ANR发生在207行。

这里是我的代码：

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");
    }

}

也是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

UnsatisfiedLinked错误是由于java类和C类之间的桥梁断裂造成的；java中的方法名称应该与C/c++类中的方法相匹配。编译桥是在Java和c/c++之间创建的，所以如果方法名不正确，它就不会响应。示例如下所示的方法名

public native String Stub(){}

这在JNI中应该是相同的，但是对于应用程序packagename+classname+methodname，如下所示

JNIEXPORT jstring JNICALL Java_com_packageName_ClassName_MethodName

Answer 2

• 在一个新的变量系统中添加正确的NDK路径: Ex。“ANDROID_NDK=.”
• 在项目的属性中，在"C/C++ Build“中的"Build命令”中，输入如下所示的变量：${ANDROID_NDK}/ndk-build.cmd

Answer 3

关键错误是“无法运行程序”ndk:启动失败“。如果不运行，.so就不会生成，这将导致UnsatisfiedLinkError。首先解决ndk-构建问题。

尝试从"\ndk-build.cmd“中删除初始的”\“。当我运行"ndk-build.cmd“时，它可以工作。