試圖包括工具欄..但得到這個異常

Question

我有一個工具欄，我已經在XML中添加了包含語句。但在MainActivity onCreate我得到這個錯誤，請幫助我。 我的主要活動類：

  package com.sample.passwordreset; 

      import android.content.Intent; 
      import android.os.Build; 
      import android.os.Bundle; 
      import android.util.Log; 
      import android.view.Menu; 
      import android.view.MenuItem; 
      import android.view.Window; 
      import android.view.WindowManager; 
      import android.support.v7.widget.Toolbar; 

      import com.parse.ParseUser; 

      public class MainActivity extends BaseActivity { 
       @Override 
       protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
        setContentView(toolbar); 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
         Window window = getWindow(); 
         window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); 
         window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); 
         window.setStatusBarColor(getResources().getColor(R.color.colorAccent)); 
        } 
        ParseUser currentUser = ParseUser.getCurrentUser(); 
        if (currentUser == null) { //User not logged in 
         Log.d("MainAcitvity", "Sending to LoginActivity!"); 
         Intent intent = new Intent(this, LoginActivity.class); 
         startActivity(intent); 
         finish(); 
        } 
       } 
       @Override 
       public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.menu_main, menu); 
        return false; 
       } 
       @Override 
       public boolean onOptionsItemSelected(MenuItem item) { 
        int id = item.getItemId(); 
        if (id == R.id.action_settings) { 
         return true; 
        } 
        return super.onOptionsItemSelected(item); 
       } 
      } 

和我activity_main.xml中

  <?xml version="1.0" encoding="utf-8"?> 
      <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       xmlns:tools="http://schemas.android.com/tools" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:background="@color/colorAccent" 
       tools:context=".MainActivity"> 
       <include 
        android:id="@+id/toolbar" 
        layout="@layout/toolbar" /> 
      </RelativeLayout> 

，這裏是我的toolbar.xml

  <?xml version="1.0" encoding="utf-8"?> 
      <android.support.v7.widget.Toolbar 
       xmlns:android="http://schemas.android.com/apk/res/android" 
       xmlns:app="http://schemas.android.com/apk/res-auto" 
       android:id="@+id/toolbar" 
       android:minHeight="?attr/actionBarSize" 
       android:background="?attr/colorPrimary" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:paddingLeft="0dp" 
       android:paddingRight="0dp" 
       app:contentInsetEnd="0dp" 
       app:contentInsetStart="0dp" 
       app:titleTextAppearance="@style/AppTheme.Toolbar.Title" 
       android:theme="@style/AppTheme" 
       app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
       /> 

日誌貓錯誤

  Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
                          at android.view.ViewGroup.addViewInner(ViewGroup.java:3672) 
                          at android.view.ViewGroup.addView(ViewGroup.java:3543) 
                          at android.view.ViewGroup.addView(ViewGroup.java:3488) 
                          at android.view.ViewGroup.addView(ViewGroup.java:3464) 
                          at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:247) 
                          at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:114) 
                          at com.sample.passwordreset.MainActivity.onCreate(MainActivity.java:21) 
                          at android.app.Activity.performCreate(Activity.java:5177) 
                          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 
                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074) 
                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)  
                          at android.app.ActivityThread.access$700(ActivityThread.java:143)  
                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)  
                          at android.os.Handler.dispatchMessage(Handler.java:99)  
                          at android.os.Looper.loop(Looper.java:137)  
                          at android.app.ActivityThread.main(ActivityThread.java:4950)  
                          at java.lang.reflect.Method.invokeNative(Native Method)  
                          at java.lang.reflect.Method.invoke(Method.java:511)  
                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)  
                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)  
                          at dalvik.system.NativeStart.main(Native Method)  
      02-05 13:02:56.358 11190-11190/com.sample.passwordreset I/Process: Sending signal. PID: 11190 SIG: 9 

LoginAc tivity

 public class LoginActivity extends NoAuthActivity { 
          private EditText mUsernameField; 
          private EditText mPasswordField; 
          private TextView mErrorField; 
          private ProgressBar spinner; 

          @Override 
          protected void onCreate(Bundle savedInstanceState) { 
           super.onCreate(savedInstanceState); 
           setContentView(R.layout.activity_login); 
           Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
           //setSupportActionBar(toolbar); 

           mUsernameField = (EditText) findViewById(R.id.login_email); 
           mPasswordField = (EditText) findViewById(R.id.login_password); 
           mErrorField = (TextView) findViewById(R.id.error_messages); 

           spinner = (ProgressBar)findViewById(R.id.progressBar1); 
           spinner.setVisibility(View.GONE); 

           Parse.initialize(this); 

           Parse.setLogLevel(Parse.LOG_LEVEL_DEBUG); 

           ParseQuery<ParseObject> qtw = ParseQuery.getQuery("tw"); 

           qtw.getFirstInBackground(new GetCallback<ParseObject>() { 
            @Override 
            public void done(ParseObject object, ParseException e) { 
             if (e == null) { 
              ParseTwitterUtils.initialize("Rakesh", "Maski"); 
             }else 
             { 
              Log.d("tx:Error",e.getMessage()); 
             } 

            } 

            /* public void done(ParseObject obj, ParseObject e) { 
             if (e == null) { 
              String tw_consumer_key = obj.get("keyid").toString(); 
              String tw_consumer_secret = obj.get("secretid").toString(); 
              //ParseTwitterUtils.initialize(tw_consumer_key, tw_consumer_secret); 
             } else { 
              //Log.d("Tw: Error", e.getMessage()); 
             } 
            }*/ 

           }); 
          } 

          public void signInNormal(final View v) { 
           v.setEnabled(false); 
           spinner.setVisibility(View.VISIBLE); 
           InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
           mgr.hideSoftInputFromWindow(mUsernameField.getWindowToken(), 0); 

           if (mUsernameField.getText().length()==0 || mPasswordField.getText().length()==0){ 
            v.setEnabled(true); 
            spinner.setVisibility(View.GONE); 
            mErrorField.setText("All the fields are required. Please fill them."); 
            return; 
           } 

           ParseUser.logInInBackground(mUsernameField.getText().toString(), 
             mPasswordField.getText().toString(), new LogInCallback() { 
              @Override 
              public void done(ParseUser user, ParseException e) { 
               if (user != null) { 
                boolean verify = user.getBoolean("emailVerified"); 
                if (!verify) { 
                 spinner.setVisibility(View.GONE); 
                 mErrorField.setText("Are you sure you're verified? Verify by opening link we have sent to your registered email & then login again."); 
                } else { 
                 spinner.setVisibility(View.GONE); 
                 Intent intent = new Intent(LoginActivity.this, MainActivity.class); 
                 startActivity(intent); 
                 finish(); 
                } 
               } else { 
                //Signup failed. Look at the ParseException to see 
                // what happened. 
                switch (e.getCode()) { 
                 case ParseException.USERNAME_TAKEN: 
                  mErrorField 
                    .setText("Sorry, this username has already been taken."); 
                  break; 
                 case ParseException.USERNAME_MISSING: 
                  mErrorField 
                    .setText("Sorry, you must supply a username to register."); 
                  break; 
                 case ParseException.PASSWORD_MISSING: 
                  mErrorField 
                    .setText("Sorry, you must supply a password to register."); 
                  break; 
                 case ParseException.OBJECT_NOT_FOUND: 
                  mErrorField 
                    .setText("Sorry, those credentials were invalid."); 
                  break; 
                 case ParseException.CONNECTION_FAILED: 
                  mErrorField 
                    .setText("Internet connection was not found. Please see your connection settings."); 
                  break; 
                 default: 
                  mErrorField.setText(e.getLocalizedMessage()); 
                  break; 
                } 
                v.setEnabled(true); 
                spinner.setVisibility(View.GONE); 
               } 
              } 
             }); 
          } 

          public void showRegistration(View v) { 
           Intent intent = new Intent(this, RegisterActivity.class); 
           startActivity(intent); 
           finish(); 
          } 

          public void forgpassActivity(View v) { 
           Intent intent = new Intent(this, ForgotPassActivity.class); 
           startActivity(intent); 
           finish(); 
          } 


          public void signInTwitter(final View v) { 
           v.setEnabled(false); 
           spinner.setVisibility(View.VISIBLE); 
           ParseTwitterUtils.logIn(this, new LogInCallback() { 
            @Override 
            public void done(ParseUser user, ParseException err) { 
             if (user == null) { 
              Log.d("RYC", "Uh oh. The user cancelled the Twitter login."); 
              spinner.setVisibility(View.GONE); 
              v.setEnabled(true); 
             } else if (user.isNew()) { 
              Log.d("RYC", "User signed up and logged in through Twitter!"); 
              String userscreenName = ParseTwitterUtils.getTwitter().getScreenName(); 
              user.put("screenName", userscreenName); 
              try { 
               user.save(); 
              } catch (ParseException e) { 
               e.printStackTrace(); 
              } 
              spinner.setVisibility(View.GONE); 
              LoginActivity.this.startActivity(new Intent(LoginActivity.this, MainActivity.class)); 
              finish(); 
             } else { 
              Log.d("RYC", "User logged in through Twitter!"); 
              String userscreenName = ParseTwitterUtils.getTwitter().getScreenName(); 
              user.put("screenName", userscreenName); 
              try { 
               user.save(); 
              } catch (ParseException e) { 
               e.printStackTrace(); 
              } 
              spinner.setVisibility(View.GONE); 
              LoginActivity.this.startActivity(new Intent(LoginActivity.this, MainActivity.class)); 
              finish(); 
             } 
            } 
           }); 
          } 
         } 

Answer 1

變化setContentView(toolbar);到setSupportActionBar(toolbar); 解決您的問題

Answer 2

與setSupportActionBar(toolbar);代替的setContentView

Answer 3

添加工具欄從我看到你的setContentView（）兩次

public class MainActivity extends BaseActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    /* 
    The point where you get error, remove the below method, 
    and your code should work fine 
    */ 
    setContentView(toolbar); 
    } 
} 

你不必的setContentView（）兩次

Answer 4

引起：java.lang.IllegalStateException：指定的子項 已經有父項。您必須先調用孩子父母 上的removeView（）。 在android.view.ViewGroup.addViewInner（ViewGroup.java:3672） 在android.view.ViewGroup.addView（ViewGroup.java:3543）

爲什麼你叫2倍setContentView()

錯誤

setContentView(R.layout.activity_main); 
       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
       setContentView(toolbar); 

做

setContentView(R.layout.activity_main); 
Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar); 
setSupportActionBar(toolbar); 

一旦你有工具欄的一個實例，我們將調用 setSupportActionBar（工具欄）和的意見對象傳遞給它。