我正在编写一个来自android的音板.问题是有些声音有效,有些无效.这是我得到的声音的回溯不起作用
05-31 13:23:04.227 18440 18603 W System.err: java.io.FileNotFoundException: This file can not be opened as a file descriptor; it is probably compressed
05-31 13:23:04.227 18440 18603 W System.err: at android.content.res.AssetManager.openAssetFd(Native Method)
05-31 13:23:04.227 18440 18603 W System.err: at android.content.res.AssetManager.openFd(AssetManager.java:331)
05-31 13:23:04.227 18440 18603 W System.err: at com.phonegap.AudioPlayer.startPlaying(AudioPlayer.java:201)
05-31 13:23:04.227 18440 18603 W System.err: at com.phonegap.AudioHandler.startPlayingAudio(AudioHandler.java:181)
05-31 13:23:04.235 18440 18603 W System.err: at com.phonegap.AudioHandler.execute(AudioHandler.java:64)
05-31 13:23:04.235 18440 18603 W System.err: at com.phonegap.api.PluginManager$1.run(PluginManager.java:86)
05-31 13:23:04.235 18440 18603 W System.err: at java.lang.Thread.run(Thread.java:1096)
有任何想法吗？
我正在尝试从jar文件加载一个接口的插件实现,该文件位于我的.apk文件的/ assets目录中.我能够让它工作的唯一方法是将jar文件解压缩到私有外部存储器,然后将该文件传递给DexClassLoader.
这有效,但为什么jar必须存在于两个地方(.apk和私人外部存储)？DexClassLoader必须以文件路径作为参数.
有没有办法给它一个直接路径到/ assets文件夹中的文件,这样我就不必使用外部存储来获取已存在的文件的额外副本？
以下是相关的代码段:
// somewhere in my main Activity ...
final File aExtractedDexFile = new File(getDir("dex", Context.MODE_PRIVATE),
LIBRARY_DEX_JAR);
extractDexTo(aExtractedDexFile);
loadLibraryProvider(aExtractedDexFile);
和
/** Extract the jar file that contains the implementation class.dex and place in private storage */
private void extractDexTo(File tJarInternalStoragePath) {
BufferedInputStream aJarInputStream = null;
OutputStream aDexOutputStream = null;
try {
aJarInputStream = new BufferedInputStream(getAssets().open(LIBRARY_DEX_JAR));
aJarOutputStream = new BufferedOutputStream(new FileOutputStream(tJarInternalStoragePath));
byte[] buf = new byte[BUF_SIZE];
int len;
while ((len = aJarInputStream.read(buf, 0, BUF_SIZE)) > 0)
{ …我的代码如下:
Scanner sc = null;
try {
sc = new Scanner(new File("assets/mainmenu/readSourceFile.txt"));
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
System.out.println(e1.toString());
e1.printStackTrace();
}
然后,logcat显示异常 java.io.FileNotFoundException
我怎样才能找到我的档案？我试过了
sc = new Scanner(new File("mainmenu/readSourceFile.txt"));
然而,它仍然是扔 FilenotFoundException
我的文件位于文件夹assets/mainmenu/readSourceFile.txt中
我试试这个::
private InputStream is;
try {
is = this.getResources().getAssets().open("mainmenu/readSourceFile.txt");
} catch (IOException e) {
e.toString();
}
我使用getAssets来访问android中的资产文件.但是,如果我使用,我怎么能想读取文本文件InputStream
我写了这样一个应用程序(它仍在进行中......).这是日志:
10-02 13:38:18.714: D/AndroidRuntime(637): Shutting down VM
10-02 13:38:18.714: W/dalvikvm(637): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
10-02 13:38:18.734: E/AndroidRuntime(637): FATAL EXCEPTION: main
10-02 13:38:18.734: E/AndroidRuntime(637): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test1/com.example.test1.MainActivity}: java.lang.NullPointerException
10-02 13:38:18.734: E/AndroidRuntime(637): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.app.ActivityThread.access$600(ActivityThread.java:130)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.os.Handler.dispatchMessage(Handler.java:99)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.os.Looper.loop(Looper.java:137)
10-02 13:38:18.734: E/AndroidRuntime(637): at android.app.ActivityThread.main(ActivityThread.java:4745)
10-02 13:38:18.734: E/AndroidRuntime(637): at java.lang.reflect.Method.invokeNative(Native Method)
10-02 13:38:18.734: E/AndroidRuntime(637): at java.lang.reflect.Method.invoke(Method.java:511)
10-02 …