尝试从文件读取时出现IllegalStateException

Question

尝试从文件读取数据时发生此致命异常。尝试过我能想到的一切，但没有运气。还查看了谷歌提供的大部分内容。它看起来似乎错误源自我的代码之外的其他地方。

有什么方法可以解决这个问题吗？

文件：

package ee.arvestus.karvastaja;

public class SquareMethodInsertActivity extends Activity {

private static BufferedReader bufferedReader;

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

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private void init() {

    InputStream fragInputStream;
    try {
        fragInputStream = getAssets().open(Constants.PATH_TO_FRAG_DATA);
    } catch (IOException e) {
        Toast.makeText(SquareMethodInsertActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
        return;
    }

    bufferedReader = new BufferedReader(new InputStreamReader(fragInputStream));

    try {
        fragInputStream.close();
    } catch (IOException e) {
        Toast.makeText(SquareMethodInsertActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
        return;
    }
}

public void addTarget(View view) {

    }



    WeaponSettings[] weaponSettings = new WeaponSettings[3];


    try {
        if (battery.getCoordinates1() != null) {
            weaponSettings[0] = getWeaponSettings(target.getDistances()[0], 4);
        }

        if (battery.getCoordinates2() != null) {
            weaponSettings[1] = getWeaponSettings(target.getDistances()[1], 4);
        }

        if (battery.getCoordinates3() != null) {
            weaponSettings[2] = getWeaponSettings(target.getDistances()[2], 4);
        }
    } catch (IOException e) {
        Toast.makeText(SquareMethodInsertActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
        return;
    }




    target.setWeaponSettings(weaponSettings.clone());
    Toast.makeText(SquareMethodInsertActivity.this, Integer.toString(target.getWeaponSettings()[0].getLaunchAngles()[0]), Toast.LENGTH_SHORT).show();

    if (!target.validate()) {
        Toast.makeText(SquareMethodInsertActivity.this, R.string.invalid_target, Toast.LENGTH_SHORT).show();
        return;
    }


    Bundle bundle = new Bundle();
    bundle.putParcelable(Constants.TARGET_PARCEL, target);
    bundle.putParcelableArrayList(Constants.TARGET_LIST_PARCEL, getIntent().getExtras().getParcelableArrayList(Constants.TARGET_LIST_PARCEL));

    Intent targetListIntent  = new Intent(this, TargetListActivity.class);
    targetListIntent.putExtras(bundle);

    startActivity(targetListIntent);
    finish();
}

private static WeaponSettings getWeaponSettings(int distance, int temperatureIndex) throws IOException {

    float tmpDistance = (float) distance / 10;
    tmpDistance = round(tmpDistance);
    tmpDistance *= 10;
    distance = (int) tmpDistance;

    int[] launchAngles = new int[3];
    float[] flightTimes = new float[3];
    int[] extraCharges = new int[3];



    String line;
    while ((line = bufferedReader.readLine()) != null) {
        int distanceFromFile = 0;
        String[] splittedLine = line.split(";");
        String[] distanceAndCharges = splittedLine[0].split(",");
        String[] launchAngleAndFlightTime = splittedLine[temperatureIndex].split(",");
        String distanceString = distanceAndCharges[0].trim();
        if (distanceString.matches("\\d+")) {
            distanceFromFile = Integer.valueOf(distanceString);
        }
        if (distance != distanceFromFile) continue;

        launchAngles[0] = Integer.valueOf(launchAngleAndFlightTime[0].trim());
        flightTimes[0] = Integer.valueOf(launchAngleAndFlightTime[1].trim());
        extraCharges[0] = Integer.valueOf(distanceAndCharges[1].trim());

        break;
    }
    bufferedReader.close();

    return new WeaponSettings(launchAngles, flightTimes, extraCharges);
}
}

logcat的：

05-16 18:44:42.346: E/AndroidRuntime(31352): FATAL EXCEPTION: main
05-16 18:44:42.346: E/AndroidRuntime(31352): java.lang.IllegalStateException: Could not execute method of the activity
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.view.View$1.onClick(View.java:3597)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.view.View.performClick(View.java:4202)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.view.View$PerformClick.run(View.java:17344)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.os.Handler.handleCallback(Handler.java:725)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.os.Handler.dispatchMessage(Handler.java:92)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.os.Looper.loop(Looper.java:137)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.app.ActivityThread.main(ActivityThread.java:5039)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.lang.reflect.Method.invokeNative(Native Method)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.lang.reflect.Method.invoke(Method.java:511)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at dalvik.system.NativeStart.main(Native Method)
05-16 18:44:42.346: E/AndroidRuntime(31352): Caused by: java.lang.reflect.InvocationTargetException
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.lang.reflect.Method.invokeNative(Native Method)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.lang.reflect.Method.invoke(Method.java:511)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.view.View$1.onClick(View.java:3592)
05-16 18:44:42.346: E/AndroidRuntime(31352):    ... 11 more
05-16 18:44:42.346: E/AndroidRuntime(31352): Caused by: java.lang.NullPointerException: asset
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.content.res.AssetManager.getAssetRemainingLength(Native Method)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.content.res.AssetManager.access$300(AssetManager.java:35)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at android.content.res.AssetManager$AssetInputStream.available(AssetManager.java:554)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.io.InputStreamReader.read(InputStreamReader.java:234)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.io.BufferedReader.fillBuf(BufferedReader.java:130)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at java.io.BufferedReader.readLine(BufferedReader.java:354)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at ee.arvestus.karvastaja.SquareMethodInsertActivity.getWeaponSettings(SquareMethodInsertActivity.java:238)
05-16 18:44:42.346: E/AndroidRuntime(31352):    at ee.arvestus.karvastaja.SquareMethodInsertActivity.addTarget(SquareMethodInsertActivity.java:179)
05-16 18:44:42.346: E/AndroidRuntime(31352):    ... 14 more

第238行是while ((line = bufferedReader.readLine()) != null) {