Question

我尝试使用选项菜单打开首选项屏幕。选项菜单的drawable在右角可见，但是当我点击它时，应用程序崩溃了。

有人可以告诉我为什么吗？

public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();
    if (id == R.id.item1) {

        Intent i = new Intent(this, SettingsActivity.class);
        startActivity(i);
        Log.d("onOptionsItemSelected","yes");

        return true;

    }
    Log.d("onOptionsItemSelected","no");

    return super.onOptionsItemSelected(item);
}

public class SettingsActivity extends AppCompatActivity {


@SuppressLint("ResourceType")
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.xml.preferences);
}
public void showDatePicker(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getFragmentManager(), "date picker");
}


}

public class DatePickerFragment extends DialogFragment {

public Dialog onCreateDialog(Bundle savedInstanceState) {
    setHasOptionsMenu(true);

    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    return new DatePickerDialog(getActivity(), dateSetListener, year, month, day);
}

private DatePickerDialog.OnDateSetListener dateSetListener =
        new DatePickerDialog.OnDateSetListener() {
            public void onDateSet(DatePicker view, int year, int month, int day) {
                Toast.makeText(getActivity(), "selected date is " + view.getYear() +
                        " / " + (view.getMonth() + 1) +
                        " / " + view.getDayOfMonth(), Toast.LENGTH_SHORT).show();
            }
        };


}

```

E / AndroidRuntime：致命异常：主要过程：com.example.m.myfirstapp，PID：4649 java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.myfirstapp / com.example.m.myfirstapp.SettingsActivity}：android.view.InflateException：二进制XML文件行＃0：二进制XML文件行＃0：错误膨胀类PreferenceScreen 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2665）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2726）在android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1477）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:154）在android.app.ActivityThread.main（ActivityThread.java:6119） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:886）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:776）引起：android.view.InflateException：二进制XML文件行＃0：二进制XML文件行＃0：错误膨胀类PreferenceScreen 引起：android.view.InflateException：二进制XML文件行＃0：错误导致类PreferenceScreen 引起：java.lang.ClassNotFoundException：路径上没有找到类“android.view.PreferenceScreen”：DexPathList [[zip file“/data/app/com.example.myfirstapp-1/base.apk”，zip文件“/data/app/com.example.m.myfirstapp-1/split_lib_dependencies_apk.apk”，zip文件“/data/app/com.example.m.myfirstapp-1/split_lib_slice_0_apk.apk”，zip文件“/ data / app / com.example.m.myfirstapp-1 / split_lib_slice_1_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/split_lib_slice_2_apk.apk“，zip文件”/ data / app / com。 example.m.myfirstapp-1 / split_lib_slice_3_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/split_lib_slice_4_apk.apk“，zip文件”/data/app/com.example.m。 myfirstapp-1 / split_lib_slice_5_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/split_lib_slice_6_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/ split_lib_slice_7_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/split_lib_slice_8_apk.apk“，zip文件”/data/app/com.example.m.myfirstapp-1/split_lib_slice_9_apk.apk “]，nativeLibraryDirectories = [/ data / app / com.example.m.myfirstapp-1 / lib / x86，/ system / lib，/ vendor / lib]]

选项菜单，首选项屏幕和日期选择器

0 个答案: