Android：默認選項卡活動不會在點擊按鈕時啓動

-2

我知道這已經被問了很多，已經完成了對這個特定主題的搜索。並且他們都返回相同的答案，但並沒有解決我的問題，我有一個單獨的XML創建一個按鈕，用作一個片段。 TabbedActivity只是不會啓動，點擊按鈕時應用程序崩潰，甚至在第一次使用代碼時拋出NPE。只是不知道該怎麼做。Android：默認選項卡活動不會在點擊按鈕時啓動

import android.content.Intent; 
import android.content.res.Configuration; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.TextView; 


public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     //Set HomeFragment as user starts the app. 
     if (savedInstanceState == null){ 
      InitStartFrag(); 
     } 

//-----BUG!-----// 
1st:Code Used 
android.support.v7.widget.AppCompatButton myButton = (android.support.v7.widget.AppCompatButton)findViewById(R.id.myButton); 
    myButton.setOnClickListener(new View.OnClickListener(){ 
     @Override 
      public void onClick(View v){ 
       Intent intent = new Intent(MainActivity.this, TabbedActivity.class); 
       startActivity(intent); 
     } 
    }); 

2nd Code: 
public void doThis(View view){ 
     Intent intent = new Intent(this, TabbedActivity.class); 
     MainActivity.this.startActivity(intent); 
    } 

3rd Code: 
public void doThis(View view){ 
     setContentView(R.layout.activity_tabbed); 
    } 
//-----Bug Ends-----// 


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

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
       this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.setDrawerListener(toggle); 
     toggle.syncState(); 

     NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
     navigationView.setNavigationItemSelectedListener(this); 

    } 



    private void InitStartFrag() { 
     android.app.FragmentManager fragmentManager = getFragmentManager(); 
     android.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     ..... 
     ..... 
    }

日誌貓：

Process: com.my_app.app_one, PID: 3799 
java.lang.IllegalStateException: Could not find a method doThis(View) in the activity class android.support.v7.widget.TintContextWrapper for onClick handler on view class android.support.v7.widget.AppCompatButton with id 'myButton' 
at android.view.View$1.onClick(View.java:3843) 
at android.view.View.performClick(View.java:4471) 
at android.view.View$PerformClick.run(View.java:18778) 
at android.os.Handler.handleCallback(Handler.java:808) 
at android.os.Handler.dispatchMessage(Handler.java:103) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:5324) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640) 
at dalvik.system.NativeStart.main(Native Method) 
Caused by: java.lang.NoSuchMethodException: doThis [class android.view.View] 
at java.lang.Class.getConstructorOrMethod(Class.java:472) 
at java.lang.Class.getMethod(Class.java:864) 
at android.view.View$1.onClick(View.java:3836) 
at android.view.View.performClick(View.java:4471)  
at android.view.View$PerformClick.run(View.java:18778)  
at android.os.Handler.handleCallback(Handler.java:808)  
at android.os.Handler.dispatchMessage(Handler.java:103)  
at android.os.Looper.loop(Looper.java:193)  
at android.app.ActivityThread.main(ActivityThread.java:5324)  
at java.lang.reflect.Method.invokeNative(Native Method)  
at java.lang.reflect.Method.invoke(Method.java:515)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)  
at dalvik.system.NativeStart.main(Native Method)

的清單：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.my_app.app_one"> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity 
      android:name=".MainActivity" 
      android:configChanges="keyboardHidden|orientation" 
      android:label="@string/app_name" 
      android:theme="@style/AppTheme.NoActionBar"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".TabbedActivity" 
      android:label="@string/title_activity_tabbed" 
      android:parentActivityName=".MainActivity" 
      android:theme="@style/AppTheme.NoActionBar"> 
      <meta-data 
       android:name="android.support.PARENT_ACTIVITY" 
       android:value="com.my_app.app_one.MainActivity" /> 
     </activity> 
    </application> 

</manifest>

的XML，作爲片段：buttons_layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <android.support.percent.PercentRelativeLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <!--Upper Buttons--> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:text="Fire" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn1" 
      android:textColor="@color/colorBtnText1" 
      android:drawableStart="@drawable/fire_icon" 
      android:drawablePadding="-62dip" 
      android:paddingLeft="30dip" 
      android:paddingRight="26dip" 
      android:singleLine="true" 
      android:gravity="center" 
      android:onClick="doThis"/> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton1" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:layout_below="@id/myButton" 
      android:text="Flood" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn3" 
      android:textColor="@color/colorBtnText3"/> 

     <!-- Divider --> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton2" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:layout_toEndOf="@id/myButton1" 
      android:text="Thunder" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn2" 
      android:textColor="@color/colorBtnText2"/> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton4" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_below="@id/myButton2" 
      android:layout_gravity="center_horizontal" 
      android:layout_toEndOf="@id/myButton1" 
      android:text="Civil Defense Operation Center" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn4" 
      android:textColor="@color/colorBtnText4"/> 

     <!--Lower Buttons--> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton5" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:layout_below="@id/myButton3" 
      android:text="Landslide" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn5" 
      android:textColor="@color/colorBtnText5"/> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton7" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:layout_below="@id/myButton5" 
      android:text="Women and Children Protection Center" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn7" 
      android:textColor="@color/colorBtnText7"/> 

     <!-- Divider --> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton6" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_gravity="center_horizontal" 
      android:layout_below="@id/myButton4" 
      android:layout_toEndOf="@id/myButton3" 
      android:text="Storm" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn6" 
      android:textColor="@color/colorBtnText6"/> 

     <android.support.v7.widget.AppCompatButton 
      android:id="@+id/myButton8" 
      android:layout_width="0dp" 
      android:layout_height="0dp" 
      android:layout_below="@id/myButton6" 
      android:layout_gravity="center_horizontal" 
      android:layout_toEndOf="@id/myButton5" 
      android:text="Earthquake" 
      android:textSize="15sp" 
      app:layout_heightPercent="25%" 
      app:layout_widthPercent="50%" 
      app:backgroundTint="@color/colorBtn8" 
      android:textColor="@color/colorBtnText8"/> 


    </android.support.percent.PercentRelativeLayout> 


</LinearLayout>

新代碼中使用：

private void InitBtnListener(){ 
     LayoutInflater layoutInflater = this.getLayoutInflater(); 
     View view = layoutInflater.inflate(R.layout.buttons_layout,null); 

     android.support.v7.widget.AppCompatButton myButton = (android.support.v7.widget.AppCompatButton)view.findViewById(R.id.myButton); 
     myButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Intent intent = new Intent(MainActivity.this, TabbedActivity.class); 
       startActivity(intent); 
      } 
     }); 
    }

TabbedFragment.java代碼

import android.app.Fragment; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 


public class TabbedFragment extends Fragment implements OnClickListener { 

    View myView; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setRetainInstance(true); 
    } 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     myView = inflater.inflate(R.layout.survival_tips_layout,container,false); 
     android.support.v7.widget.AppCompatButton myButton = (android.support.v7.widget.AppCompatButton)myView.findViewById(R.id.myButton); 
     myButton.setOnClickListener(this); 
     return myView; 
    } 

    @Override 
    public void onClick(View view) { 
     switch (view.getId()){ 
      case R.id.myButton: 

     //--Missing Code:--// 
     After Btn Click Fire up that TabbedActivity. 
     //--Ends--// 

     // Can I do intents Here? 
     Intent intent = new Intent(MainActivity.this,TabbedActivity.class); 
     startActivity(intent); 
     break; 

     } 

    } 
}

來源

2016-08-31 NewbieBeLike

'引起：java.lang.NoSuchMethodException：doThis [類android.view.View]'這不是一個NPE。 **不要在一個問題中混用**不同的代碼和錯誤。 –

對不起，你能幫我嗎，我該怎麼辦？ – NewbieBeLike

選擇一個錯誤代碼併發布關於該錯誤的問題。並得到相關的幫助。 –

此行需要爲上述任何findViewById

setContentView(R.layout.activity_main);

如果從XML定義，則需要一個public方法接受帶有該名稱的View參數。

例如，android:onClick="doThis"意味着需要這種方法

public void doThis(View view) { 
    // TODO: Handle click 
}

我已經在單獨的XML創建的按鈕，用作片段

然後，你需要找到從Fragment類的按鈕。您無法從活動中找到它。

例如

public class MyFragment extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) { 
     // Inflate the layout 
     View rootView = inflater.inflate(R.layoutbuttons_layout, parentViewGroup, false); 

     Button button = (Button) rootView.findViewById(R.id.button); 
     // TODO: button.setOnClickListener(); 

     return rootView; 
    } 

    // OR... if you have android:onclick="doThis" 
    public void doThis(View view) { 
     // TODO: Handle click 
    } 
}

來源

2016-08-31 16:49:31

謝謝，我確實從xml中定義了它。我也從MainActivity.java創建了這個單獨的函數。我只是沒有什麼確切的代碼，當它調用該函數。注意使用的第二個代碼。這是一個合適的方法嗎？ – NewbieBeLike

這取決於按鈕在哪個XML中。但是，如果這種方法不屬於另一種方法，那就是正確的方法。「使用的第一個代碼」是我推薦的方法，但同樣，您必須先設置活動的內容視圖，然後才能找到該按鈕。請'編輯'您的問題，以顯示哪個XML文件，該按鈕包含在 –

哥們，我目前正在使用第二個代碼。當我點擊按鈕時，應用程序崩潰。難道我做錯了什麼？該功能獨立於MainActivity.java – NewbieBeLike

Android：默認選項卡活動不會在點擊按鈕時啓動

回答

相關問題