Question

我已经使用了许多教程来开始使用android和jni。我的上一次是this step by step tutorial。我经历了所有的步骤。但是当我运行它时，应用程序停止运行。我用过genymotion

我创建了Android应用＆＃34; HelloTest＆＃34;
在App的根目录中创建jni文件夹：/ home / nikolay / workspace / HelloTest / jni

在jni文件夹中创建Android.mk文件：

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE    := hello
LOCAL_SRC_FILES := hello.cpp
include $(BUILD_SHARED_LIBRARY)

在jni文件夹文件中创建hello.cpp

#include <jni.h>
jint Java_com_nikolay_hellotest_MainActivity(JNIEnv* env, jobject javaThis, jint a) {
return a*a;

}

打开终端并转到我的项目文件夹，然后成功运行ndk-build：

[armeabi] Compile++ thumb: hello <= hello.cpp
[armeabi] StaticLibrary  : libstdc++.a
[armeabi] SharedLibrary  : libhello.so
[armeabi] Install        : libhello.so => libs/armeabi/libhello.so

向MainActivity添加一些代码：

package com.nikolay.hellotest;
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;

public class MainActivity extends Activity {
  // load the library - name matches jni/Android.mk 
static {
   System.loadLibrary("hello");
}
// declare the native code function - must match hello.cpp
public native int getIntValue(int val);

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

if (savedInstanceState == null) {
    getFragmentManager().beginTransaction()
            .add(R.id.container, new PlaceholderFragment()).commit();
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
    return true;
}
return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

public PlaceholderFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_main, container,
            false);

    TextView tv = (TextView) rootView.findViewById(R.id.textView1);
    tv.setText(Integer.toString(new MainActivity().getIntValue(24)));

    return rootView;
}
}
}

添加了：

    static {
       System.loadLibrary("hello");
    }
    // declare the native code function - must match hello.cpp
    public native int getIntValue(int val);

和

     TextView tv = (TextView) rootView.findViewById(R.id.textView1);
        tv.setText(Integer.toString(new MainActivity().getIntValue(24)));

我无法理解错误。感谢任何帮助。

Answer 1

修改|在jni文件夹“APP_ABI：= x86”

中添加Application.mk

无法使用genymotion在eclipse中运行android jni app

1 个答案: