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  3. Нужно добавить пункт меню в приложение

Нужно добавить пункт меню в приложение

2015-11-10 2 views
0

Я пытаюсь добавить пункт меню, который очистит все поля EditText. Прямо сейчас у меня это как элемент Toast, который появляется в течение короткого периода времени, но мне нужно, чтобы он очистил любой текст, который был введен.Нужно добавить пункт меню в приложение

MainActivity

package 340.converter; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 

import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    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(); 
     } 
    }); 
    final EditText NumKnots = (EditText) findViewById(R.id.NumKnots); 
    final EditText NumMPH = (EditText) findViewById(R.id.NumMPH); 
    Button MPHConvert = (Button) findViewById(R.id.MPHConv); 

    MPHConvert.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double Knots = Double.valueOf(NumKnots.getText().toString()); 
      double MPH = Knots * 1.15078; 
      NumMPH.setText(String.valueOf(MPH)); 

     } 
    }); 

    final EditText NumNMile = (EditText) findViewById(R.id.NumNMile); 
    final EditText NumSMiles = (EditText) findViewById(R.id.NumSMiles); 
    Button SMilesConv = (Button) findViewById(R.id.SMilesConv); 

    SMilesConv.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double NMile = Double.valueOf(NumNMile.getText().toString()); 
      double SMiles = NMile * 1.15078; 
      NumSMiles.setText(String.valueOf(SMiles)); 

     } 
    }); 

    final EditText NumCHead = (EditText) findViewById(R.id.NumCHead); 
    final EditText NumRHead = (EditText) findViewById(R.id.NumRHead); 
    Button RHeadConv = (Button) findViewById(R.id.RHeadConv); 

    RHeadConv.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double CHead = Double.valueOf(NumCHead.getText().toString()); 
      double RHead = CHead + 180; 
      NumRHead.setText(String.valueOf(RHead)); 

     } 
    }); 
} 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_Clear) 
    { 
     Toast.makeText(getApplicationContext(), R.string.action_Clear, Toast.LENGTH_SHORT).show(); 
     return true; 
    } 
    else if(id == R.id.action_About) 
    { 
     Toast.makeText(getApplicationContext(), "Created by: \n For: \n Year Created: ", Toast.LENGTH_LONG).show(); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 
}

content_main

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" 
android:layout_height="match_parent"  android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin" 
app:layout_behavior="@string/appbar_scrolling_view_behavior" 
tools:showIn="@layout/activity_main" tools:context=".MainActivity"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtKnots" 
    android:id="@+id/txtKnots" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/MPHConv" 
    android:id="@+id/MPHConv" 
    android:layout_below="@+id/txtKnots" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtMPH" 
    android:id="@+id/txtMPH" 
    android:layout_below="@+id/MPHConv" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtNMiles" 
    android:id="@+id/txtNMiles" 
    android:layout_below="@+id/txtMPH" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="32dp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/SMilesConv" 
    android:id="@+id/SMilesConv" 
    android:layout_below="@+id/txtNMiles" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtSMile" 
    android:id="@+id/txtSMile" 
    android:layout_below="@+id/SMilesConv" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtCHead" 
    android:id="@+id/txtCHead" 
    android:layout_below="@+id/txtSMile" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="43dp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/RHeadConv" 
    android:id="@+id/RHeadConv" 
    android:layout_below="@+id/txtCHead" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="@string/txtRHead" 
    android:id="@+id/txtRHead" 
    android:layout_below="@+id/RHeadConv" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumKnots" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/txtRHead" 
    android:layout_toEndOf="@+id/txtRHead" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumMPH" 
    android:layout_above="@+id/txtNMiles" 
    android:layout_alignRight="@+id/NumKnots" 
    android:layout_alignEnd="@+id/NumKnots" 
    android:layout_below="@+id/NumKnots" 
    android:layout_alignLeft="@+id/NumKnots" 
    android:layout_alignStart="@+id/NumKnots" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumNMile" 
    android:layout_above="@+id/SMilesConv" 
    android:layout_alignRight="@+id/NumMPH" 
    android:layout_alignEnd="@+id/NumMPH" 
    android:layout_below="@+id/NumMPH" 
    android:layout_alignLeft="@+id/NumMPH" 
    android:layout_alignStart="@+id/NumMPH" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumSMiles" 
    android:layout_alignBottom="@+id/txtSMile" 
    android:layout_alignRight="@+id/NumNMile" 
    android:layout_alignEnd="@+id/NumNMile" 
    android:layout_below="@+id/NumNMile" 
    android:layout_alignLeft="@+id/NumNMile" 
    android:layout_alignStart="@+id/NumNMile" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumCHead" 
    android:layout_above="@+id/RHeadConv" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_below="@+id/NumSMiles" 
    android:layout_alignLeft="@+id/NumSMiles" 
    android:layout_alignStart="@+id/NumSMiles" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="numberDecimal" 
    android:ems="10" 
    android:id="@+id/NumRHead" 
    android:layout_alignBottom="@+id/txtRHead" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_alignTop="@+id/RHeadConv" 
    android:layout_alignLeft="@+id/NumCHead" 
    android:layout_alignStart="@+id/NumCHead" /> 
</RelativeLayout>

струны

<resources> 
<string name="app_name">Converter</string> 
<string name="action_settings">Settings</string> 
<string name="action_Clear">Clear Screen</string> 
<string name="action_About">About</string> 
<string name="txtKnots">Knots</string> 
<string name="txtMPH">MPH</string> 
<string name="txtNMiles">Nautical Miles</string> 
<string name="txtSMile">Statute Miles</string> 
<string name="txtRHead">Reciprocal Heading</string> 
<string name="txtCHead">Compass Heading</string> 
<string name="MPHConv">Convert</string> 
<string name="SMilesConv">Convert</string> 
<string name="RHeadConv">Convert</string> 
</resources>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
android:layout_height="match_parent" android:fitsSystemWindows="true" 
tools:context=".MainActivity"> 

<android.support.design.widget.AppBarLayout android:layout_height="wrap_content" 
    android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay"> 

    <android.support.v7.widget.Toolbar android:id="@+id/toolbar" 
     android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" 
     android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> 

</android.support.design.widget.AppBarLayout> 

<include layout="@layout/content_main" /> 

<android.support.design.widget.FloatingActionButton android:id="@+id/fab" 
    android:layout_width="wrap_content" android:layout_height="wrap_content" 
    android:layout_gravity="bottom|end"  android:layout_margin="@dimen/fab_margin" 
    android:src="@android:drawable/ic_dialog_email" /> 

</android.support.design.widget.CoordinatorLayout> 




package 340.converter; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    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(); 
     } 
    }); 
    final EditText NumKnots = (EditText) findViewById(R.id.NumKnots); 
    final EditText NumMPH = (EditText) findViewById(R.id.NumMPH); 
    Button MPHConvert = (Button) findViewById(R.id.MPHConv); 

    MPHConvert.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double Knots = Double.valueOf(NumKnots.getText().toString()); 
      double MPH = Knots * 1.15078; 
      NumMPH.setText(String.valueOf(MPH)); 

     } 
    }); 

    final EditText NumNMile = (EditText) findViewById(R.id.NumNMile); 
    final EditText NumSMiles = (EditText) findViewById(R.id.NumSMiles); 
    Button SMilesConv = (Button) findViewById(R.id.SMilesConv); 

    SMilesConv.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double NMile = Double.valueOf(NumNMile.getText().toString()); 
      double SMiles = NMile * 1.15078; 
      NumSMiles.setText(String.valueOf(SMiles)); 

     } 
    }); 

    final EditText NumCHead = (EditText) findViewById(R.id.NumCHead); 
    final EditText NumRHead = (EditText) findViewById(R.id.NumRHead); 
    Button RHeadConv = (Button) findViewById(R.id.RHeadConv); 

    RHeadConv.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      double CHead = Double.valueOf(NumCHead.getText().toString()); 
      double RHead = CHead + 180; 
      NumRHead.setText(String.valueOf(RHead)); 

     } 
    }); 
} 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 
    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_About) 
    { 
     Toast.makeText(getApplicationContext(), "Created by: \n For: \n Year Created: ", Toast.LENGTH_LONG).show(); 
     return true; 
    } 
    android.view.ViewGroup group = (android.view.ViewGroup)findViewById(R.id.action_Clear); 
    for (int k = 0, count = group.getChildCount(); k < count; k++) 
    { 
     View view = group.getChildAt(k); 
     if (view instanceof EditText) 
     { 
      ((EditText)view).setText(""); 
     } 
    } 
    return super.onOptionsItemSelected(item); 
} 
}

11-09 12: 03: 57.725 28029-28029/340.конвертер W/EGL_emulation: eglSurfaceAttrib не реализован 11-09 12: 04: 01.415 28029-28029/340.конвертер D/AndroidRuntime: выключение VM 11- 09 12: 04: 01.415 28029-28029/340.converter W/dalvikvm: threadid = 1: выход с отключенным исключением (группа = 0xb0caeb20) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime : FATAL EXCEPTION: main 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: Process: 340.converter, PID: 28029 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: java.lang.NullPointerException 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at 340.converter.MainActivity.onOptionsItemSelected (MainActivity.java:98) 11-09 12: 04: 01,415 28029-280 29/340.converter E/AndroidRuntime: at android.app.Activity.onMenuItemSelected (Activity.java:2600) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v4 .app.FragmentActivity.onMenuItemSelected (FragmentActivity.java:361) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.app.AppCompatActivity.onMenuItemSelected (AppCompatActivity.java: 147) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected (WindowCallbackWrapper.java:100) 11-09 12:04 : 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected (WindowCallbackWrapper.java:100) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.i nternal.app.ToolbarActionBar $ 2.onMenuItemClick (ToolbarActionBar.java:73) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.widget.Toolbar $ 1.onMenuItemClick (панель инструментов .java: 180) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.widget.ActionMenuView $ MenuBuilderCallback.onMenuItemSelected (ActionMenuView.java:761) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected (MenuBuilder.java:811) 11-09 12: 04: 01.415 28029- 28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.menu.MenuItemImpl.invoke (MenuItemImpl.java:153) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.menu.MenuBuilder.performItemAction (MenuBuilder .java: 958) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.menu.MenuBuilder.performItemAction (MenuBuilder.java:948) 11 -09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.support.v7.internal.view.menu.MenuPopupHelper.onItemClick (MenuPopupHelper.java:191) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.widget.AdapterView.performItemClick (AdapterView.java:299) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.widget ,AbsListView.performItemClick (AbsListView.java:1113) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.widget.AbsListView $ PerformClick.run (AbsListView.java:2911) 11- 09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.widget.AbsListView $ 3.run (AbsListView.java:3645) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.os.Handler.handleCallback (Handler.java:733) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.os.Handler.dispatchMessage (Handler.java : 95) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at android.os.Looper.loop (Looper.java:136) 11-09 12: 04: 01.415 28029-28029 /340.converter E/AndroidRuntime: at android.app.ActivityThread.main (ActivityThread.java:5001) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at java.lang.reflect.Method.invokeNative (родной метод) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at java.lang.reflect.Method.invoke (Method.java:515) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at com.android.internal.os. ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:785) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:601) 11-09 12: 04: 01.415 28029-28029/340.converter E/AndroidRuntime: at dalvik.system.NativeStart.main (родной метод) 11-09 12: 04: 01.425 1254-1376/system_process D /: HostConnection :: get() Установлено новое хост-соединение 0xb8cb5ba0, tid 1376

источник

2015-11-10 RJohnson

ответ

0

Вы можете перебирать всех детей в группе просмотра и очищать все поля EditText:

ViewGroup vgroup = (ViewGroup)findViewById(R.id.linearLayout); 
for (int k = 0, k < vgroup.getChildCount(); k++) 
{ 
    View view = vgroup.getChildAt(k); 
    if (view instanceof EditText) 
    { 
     ((EditText)view).setText(""); field 
    } 
}

источник

2015-11-10 22:32:50 Smittey

+0

Где именно я это помещаю? – RJohnson

+0

«Прямо сейчас у меня это как элемент« Тост », который появляется на короткий период, но мне нужно его, чтобы очистить любой текст, который был введен». - от вашего вопроса, похоже, что это должно быть где тост – Smittey

+0

Это то, что я вложил, но он падает, когда я очищаю экран. @Override public boolean onOptionsItemSelected (элемент MenuItem) {int id = item.getItemId(); if (id == R.id.action_About) {Toast.makeText (getApplicationContext(), "Создано: \ n Для: \ n Год создания:", Toast.LENGTH_LONG) .show(); return true; } android.view.ViewGroup group = (android.view.ViewGroup) findViewById (R.id.action_Clear); for (int k = 0, count = group.getChildCount(); k RJohnson

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