如何在 Nativescript 中实现 Java 方法？

Question

我在为 ffmpeg 调用 Android java 库的某些方法时遇到问题。我想我成功加载了库，因为我可以 console.log 库对象：

JS: BuildConfig -> function () { [native code] }
JS: ExecuteBinaryResponseHandler -> function () { [native code] }
JS: FFmpeg -> function () { [native code] }
JS: FFmpegExecuteResponseHandler -> function () { [native code] }
JS: FFmpegLoadBinaryResponseHandler -> function () { [native code] }
JS: LoadBinaryResponseHandler -> function () { [native code] }

This is the code I want to "translate" (under Usage)

这是我走了多远（using this nativescript guide）：

// [...]

var MyCustomLoadBinaryResponseHandler = 
com.github.hiteshsondhi88.libffmpeg
.LoadBinaryResponseHandler.extend({
  onStart: function() {
    console.log('Started loading ffmpeg');
  },
  onFailure: function() {
    console.log('Failed loading ffmpeg');
  },
  onSuccess: function() {
    console.log('Successfully loaded ffmpeg');
  },
  onFinish: function() {
    console.log('Finished loading ffmpeg');
  }
});

console.dir(MyCustomLoadBinaryResponseHandler);
//^ this logs the following
//~ JS: === dump(): dumping members ===
//~ JS: "()function () { [native code] }"
//~ JS: === dump(): dumping function and properties names ===
//~ JS: extend()
//~ JS: null()
//~ JS: === dump(): finished ===

var context = app.android.context;

var ffmpeg = 
com.github.hiteshsondhi88.libffmpeg.FFmpeg.getInstance(context);

console.dir(ffmpeg);
//^ this logs the following
//~ JS: === dump(): dumping members ===
//~ JS: {
//~ JS:     "constructor": "constructor()function () { [native code] 
//}"
//~ JS: }
//~ JS: === dump(): dumping function and properties names ===
//~ JS: constructor()
//~ JS: concatenate()
//~ JS: execute()
//~ JS: getDeviceFFmpegVersion()
//~ JS: getLibraryFFmpegVersion()
//~ JS: isFFmpegCommandRunning()
//~ JS: killRunningProcesses()
//~ JS: loadBinary()
//~ JS: setTimeout()
//~ JS: <init>()
//~ JS: clone()
//~ JS: equals()
//~ JS: finalize()
//~ JS: getClass()
//~ JS: hashCode()
//~ JS: notify()
//~ JS: notifyAll()
//~ JS: toString()
//~ JS: wait()
//~ JS: === dump(): finished ===


ffmpeg.loadBinary(
  new MyCustomLoadBinaryResponseHandler()
);

var MyCustomExecuteBinaryResponseHandler = 
com.github.hiteshsondhi88.libffmpeg
.ExecuteBinaryResponseHandler.extend({
  onStart: function() {
    console.log('Started running ffmpeg');
  },
  onProgress: function(thisMessage) {
    console.log(' ffmpeg running');
    console.log(thisMessage);
  },
  onFailure: function(thisMessage) {
    console.log('Failed running ffmpeg');
    console.log(thisMessage);
  },
  onSuccess: function(thisMessage) {
    console.log('Successfully run ffmpeg');
    console.log(thisMessage);
  },
  onFinish: function() {
    console.log('Finished running ffmpeg');
  }
});

//this is where it crashes
ffmpeg.execute('-version', new 
MyCustomExecuteBinaryResponseHandler());

不幸的是，整个应用程序崩溃，没有错误消息，除非我有更多关于正在发生的事情的信息，否则我无法继续。我是否以错误的方式实施这些方法？你建议我如何继续？

编辑：这些是控制台上的最后日志

09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]     from java.lang.Object com.tns.Runtime.callJSMethodNative(int, int, java.lang.String, int, boolean, java.lang.Object[])
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.callJSMethodNative(Native method)
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.callJSMethod(Runtime.java:912)
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.callJSMethod(Runtime.java:896)
09-06 11:22:58.884 31522 31522 F art     : art/runtime/java_vm_ext.cc:470]   at com.tns.Runtime.callJSMethod(Runtime.java:888)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethodNative(Native method)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:912)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:896)
09-06 11:22:59.021 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:888)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethodNative(Native method)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:912)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:896)
09-06 11:22:59.022 31522 31522 F art     : art/runtime/runtime.cc:403]   at com.tns.Runtime.callJSMethod(Runtime.java:888)

Answer 1

根据示例github存储库https://github.com/WritingMinds/ffmpeg-android-java/blob/master/app/src/main/java/com/github/hiteshsondhi88/sampleffmpeg/Home.java#L80

execute 方法接受一个字符串集合/数组作为它的第一个参数。因此，您的代码应如下所示：

ffmpeg.execute(['-version'], new MyCustomExecuteBinaryResponseHandler());