Android应用程序在KitKat4.4上推出后似乎会崩溃

Question

当我的应用程序安装在我的相对较新的运行奥利奥8.0的华为上时，我的应用程序能够顺利地启动和运行。该应用程序在运行Lollipop的Nexus模拟器上也运行良好。然而，在我的另一部运行KitKat4.4的手机上，应用程序在启动时就崩溃了。

我认为问题是在添加默认NavigationDrawerActivity时发生的。

public class LoginActivity extends Activity {


    private UserLoginTask mAuthTask = null;

    // UI references.
    private EditText mEmailView;
    private EditText mPasswordView;
    private TextView mRegistrationScreen;
    private View mProgressView;
    private View mLoginFormView;
    public String id;

    @Override
    @TargetApi(19)
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);

        setContentView(R.layout.activity_login_registration);
        // Set up the login form.
        mEmailView = (EditText) findViewById(R.id.email);
        mPasswordView = (EditText) findViewById(R.id.password);

        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
        mRegistrationScreen = findViewById(R.id.registerLink);
        mEmailSignInButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                String emailAddress = mEmailView.getText().toString().trim();
                String password = mPasswordView.getText().toString().trim();
                UserLoginTask callDOIB = new UserLoginTask();
                try {
                    String loginSuccessFail = callDOIB.execute(emailAddress, password).get();
                    try {
                        JSONObject jsonObject = new JSONObject(loginSuccessFail);
                        id = jsonObject.getString("id");
                        //JSONObject id = jArray.getJSONObject(0);
                        System.out.println("json object at LoginActivity id is "+id);
                        authoriseLogin(loginSuccessFail, id);
                    }catch (JSONException e){
                        e.printStackTrace();
                    }

                }catch(InterruptedException e){
                    e.printStackTrace();
                }
                catch (ExecutionException e){
                    e.printStackTrace();
                }
            }
        });

        mRegistrationScreen.setOnClickListener(new OnClickListener(){
            public void onClick(View v){
                Intent loadRegistration = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(loadRegistration);
            }
        });
    }






    public void authoriseLogin(String authorise, String id){
        if (authorise.contains("id")) {
            System.out.println(" accessLRA.authoriseLogin login has been called");
            Session session = new Session(getApplicationContext());
            session.setId(id);
            Intent loadPersonal = new Intent(LoginActivity.this, MainActivity.class);
            startActivity(loadPersonal);

            System.out.println("Login has been authorised");
        }
        else{
            System.out.println("Incorrect username or password");
        }
    }





    }

java.lang.RuntimeException：无法启动activity ComponentInfo{com.example.a_phi.myApplication/com.example.a_phi.myApplication.LoginActivity}：Android.View.InflateException：二进制XML文件行#2:inflating类时出错

Answer 1

正如评论部分所建议的，我实际上丢失了一些支持Android Kitkat的API level 21的其他RES-V21文件夹。出于某种原因，我没有把他们搬到我的新项目中。现在起作用了，谢谢。