08-16 20:55:41.769 E/AndroidRuntime(23151): java.lang.NoSuchMethodError: no non-static method "Lcom/example/jniffmpegstaticplay/JNIffPlay
er;.onPrepareFromJNI()"
08-16 20:55:41.769 E/AndroidRuntime(23151): at com.example.jniffmpegstaticplay.JNIffPlayer.native_prepare(Native Method)
08-16 20:55:41.769 E/AndroidRuntime(23151): at com.example.jniffmpegstaticplay.JNIffPlayer.prepare(JNIffPlayer.java:46)
08-16 20:55:41.769 E/AndroidRuntime(23151): at com.example.jniffmpegstaticplay.MainActivity$1.onClick(MainActivity.java:54)
08-16 20:55:41.769 E/AndroidRuntime(23151): at android.view.View.performClick(View.java:7192)
08-16 20:55:41.769 E/AndroidRuntime(23151): at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:111
現(xiàn)象：直接閃退矢赁，日志不多
用adb命令adb shell logcat -v time > D:\logcat.txt抓取到上面日志
原因：onPrepareFromJNI方法找不到科汗，檢查路徑發(fā)現(xiàn)沒問題，懷疑是JNI反射調(diào)用Java方法簽名有問題感局。
-
找到出問題的class文件
2021-08-16_214938.png - cmd窗口查看類的方法簽名：
$ cd 文件路徑
$ javap -s -p JNIffPlayer
得到結(jié)果：
public void prepare();
descriptor: ()V
public void setDataSource(java.lang.String);
descriptor: (Ljava/lang/String;)V
public void onPrepareFromJNI();
descriptor: ()V
# 方法簽名是：()V
public void onProgressFromJNI(int);
descriptor: (I)V
public void onErrorFromJNI(int);
descriptor: (I)V
public void start();
descriptor: ()V
public void setOnPrepareListener(com.example.jniffmpegstaticplay.JNIffPlayer$OnPrepareListener);
descriptor: (Lcom/example/jniffmpegstaticplay/JNIffPlayer$OnPrepareListener;)V
解決：
修改反射方法的簽名：
2021-08-16_215823.png
