Question

我下载闹钟应用，因为我需要看看它是如何工作的。 GNU许可证。

但我无法运行它。当我点击（某事？）时，我收到了这个错误：

        08-03 14:40:26.154: E/AndroidRuntime(255):  at com.codeskraps.talarkam.TalarkamActivity.onResume(TalarkamActivity.java:108)

部分代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d(TAG, "onCreate Started");

    setContentView(R.layout.alarm_controller);

    prefs = PreferenceManager.getDefaultSharedPreferences(this);

    tpAlarm = (TimePicker) findViewById(R.id.tpAlarm);
    chkSnooze = (CheckBox) findViewById(R.id.chkSnooze);
    etxtSnoozeMin = (EditText) findViewById(R.id.etxtSnoozeMin);
    Button button = (Button) findViewById(R.id.btnSetAlarm);
    btnSetTone = (Button) findViewById(R.id.btnSetTone);
    chkVolume = (CheckBox) findViewById(R.id.chkVolume);
    skbVolume = (SeekBar) findViewById(R.id.skbVolume);

    button.setOnClickListener(setAlarmListener);
    btnSetTone.setOnClickListener(this);
}


protected void onResume() {
    Log.d(TAG, "onResume");
    super.onResume();

    tpAlarm.setCurrentHour(prefs.getInt(M_HOUR, 0));
    tpAlarm.setCurrentMinute(prefs.getInt(M_MINT, 0));
    chkSnooze.setChecked(prefs.getBoolean(M_SNOOZE, false));
    etxtSnoozeMin.setText(prefs.getString(SNOOZE_T, "0"));
    chkVolume.setChecked(prefs.getBoolean(CHKVOLUME, false));
    skbVolume.setProgress(prefs.getInt(SKBVOLUME, 0));

    Uri alarmUri = Uri.parse(prefs.getString(TONE, null));
    Ringtone ringtone = RingtoneManager.getRingtone(this, alarmUri);
    if (ringtone != null) {
        String name = ringtone.getTitle(this);
        btnSetTone.setText(name);
    } else
        btnSetTone.setText(getString(R.string.btn_SetAlarmTone));

    if (prefs.getBoolean(FIRST_LAUNCH, true)) {
        Intent checkIntent = new Intent();
        checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);

        SharedPreferences.Editor editor = prefs.edit();

        editor.putBoolean(FIRST_LAUNCH, false);
        editor.commit();
    }
}


protected void onPause() {
    Log.d(TAG, "onPause");
    super.onPause();

    SharedPreferences.Editor editor = prefs.edit();

    editor.putInt(M_HOUR, tpAlarm.getCurrentHour());
    editor.putInt(M_MINT, tpAlarm.getCurrentMinute());
    editor.putBoolean(M_SNOOZE, chkSnooze.isChecked());
    editor.putString(SNOOZE_T, etxtSnoozeMin.getText().toString());
    editor.putBoolean(CHKVOLUME, chkVolume.isChecked());
    editor.putInt(SKBVOLUME, skbVolume.getProgress());

    editor.commit();
}

logcat的：

08-03 14:40:25.684: D/TalarkamActivity(255): onCreate Started
08-03 14:40:25.965: D/dalvikvm(255): GC freed 599 objects / 51056 bytes in 86ms
08-03 14:40:26.134: D/TalarkamActivity(255): onResume
08-03 14:40:26.144: D/AndroidRuntime(255): Shutting down VM
08-03 14:40:26.144: W/dalvikvm(255): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
08-03 14:40:26.144: E/AndroidRuntime(255): Uncaught handler: thread main exiting due to uncaught exception
08-03 14:40:26.154: E/AndroidRuntime(255): java.lang.RuntimeException: Unable to resume activity {com.codeskraps.talarkam/com.codeskraps.talarkam.TalarkamActivity}: java.lang.NullPointerException: uriString
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2950)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2965)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2516)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.access$2200(ActivityThread.java:119)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.os.Looper.loop(Looper.java:123)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.main(ActivityThread.java:4363)
08-03 14:40:26.154: E/AndroidRuntime(255):  at java.lang.reflect.Method.invokeNative(Native Method)
08-03 14:40:26.154: E/AndroidRuntime(255):  at java.lang.reflect.Method.invoke(Method.java:521)
08-03 14:40:26.154: E/AndroidRuntime(255):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-03 14:40:26.154: E/AndroidRuntime(255):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-03 14:40:26.154: E/AndroidRuntime(255):  at dalvik.system.NativeStart.main(Native Method)
08-03 14:40:26.154: E/AndroidRuntime(255): Caused by: java.lang.NullPointerException: uriString
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.net.Uri$StringUri.<init>(Uri.java:420)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.net.Uri$StringUri.<init>(Uri.java:410)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.net.Uri.parse(Uri.java:382)
08-03 14:40:26.154: E/AndroidRuntime(255):  at com.codeskraps.talarkam.TalarkamActivity.onResume(TalarkamActivity.java:108)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.Activity.performResume(Activity.java:3763)
08-03 14:40:26.154: E/AndroidRuntime(255):  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2937)

Answer 1

错误出现在onResume()：

中

Uri alarmUri = Uri.parse(prefs.getString(TONE, null));

如果此首选项不存在，则默认为null，这会导致NullPointerException。

编辑添加了代码建议以摆脱NPE

在onResume()：

中替换此代码

Uri alarmUri = Uri.parse(prefs.getString(TONE, null));
Ringtone ringtone = RingtoneManager.getRingtone(this, alarmUri);
if (ringtone != null) {
    String name = ringtone.getTitle(this);
    btnSetTone.setText(name);
} else
    btnSetTone.setText(getString(R.string.btn_SetAlarmTone));

使用此代码：

Ringtone ringtone = null;
String toneString = prefs.getString(TONE, null);
if (toneString != null) {
    Uri alarmUri = Uri.parse(toneString);
    ringtone = RingtoneManager.getRingtone(this, alarmUri);
}
if (ringtone != null) {
    String name = ringtone.getTitle(this);
    btnSetTone.setText(name);
} else {
    btnSetTone.setText(getString(R.string.btn_SetAlarmTone));
}

Answer 2

由于你还没有发布整个代码，因此弄清楚它失败的线路是否很棘手（第108行？）。但我的猜测是以下行是根本原因：

Uri alarmUri = Uri.parse（prefs.getString（TONE，null））;

在prefs中找不到TONE键/对象，并将默认值设置为null。

Android - 闹钟错误

2 个答案: