Kann meine App nicht in die Registerkarten-Registerkarte Material integrieren

Question

Ich bin neu in der Android-Entwicklung Ich habe eine Android-App erstellt und jetzt möchte ich die App in Material-Registerkartenansicht migrieren, aber ich kann nicht verstehen, wie es geht. Dies ist meine aktuellen Code

Manifest-Datei:

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

<uses-permission android:name="android.permission.SEND_SMS" /> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 

<uses-feature 
    android:glEsVersion="0x00020000" 
    android:required="true" /> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/MyMaterialTheme"> 
    <activity android:name="com.package.MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

    <meta-data 
     android:name="com.google.android.geo.API_KEY" 
     android:value="xxxxxxxxxxxx" /> 
    <meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version" /> 

</application> 

</manifest> 

Hauptaktivität

import android.os.Bundle; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 

import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends AppCompatActivity { 
    private Toolbar toolbar; 
    private TabLayout tabLayout; 
    private ViewPager viewPager; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    viewPager = (ViewPager) findViewById(R.id.viewpager); 
    setupViewPager(viewPager); 

    tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(viewPager); 
    } 


    private void setupViewPager(ViewPager viewPager) { 
     ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
    adapter.addFragment(new Message(), "Message"); 
    adapter.addFragment(new Maps(), "Maps"); 
    viewPager.setAdapter(adapter); 
    } 

    class ViewPagerAdapter extends FragmentPagerAdapter { 
     private final List<Fragment> mFragmentList = new ArrayList<>(); 
     private final List<String> mFragmentTitleList = new ArrayList<>(); 

     public ViewPagerAdapter(FragmentManager manager) { 
      super(manager); 
     } 

    @Override 
    public Fragment getItem(int position) { 
     return mFragmentList.get(position); 
    } 

    @Override 
    public int getCount() { 
     return mFragmentList.size(); 
     } 

     public void addFragment(Fragment fragment, String title) { 
     mFragmentList.add(fragment); 
     mFragmentTitleList.add(title); 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
     return mFragmentTitleList.get(position); 
     } 
    } 
    } 

Maps.java (Fragment in tab)

import android.Manifest; 
    import android.content.pm.PackageManager; 
    import android.support.v4.app.ActivityCompat; 
    import android.support.v4.app.Fragment; 
    import android.support.v7.app.AppCompatActivity; 
    import android.app.Activity; 
    import android.os.Bundle; 

    import com.google.android.gms.maps.CameraUpdateFactory; 
    import com.google.android.gms.maps.GoogleMap; 
    import com.google.android.gms.maps.MapFragment; 
    import com.google.android.gms.maps.OnMapReadyCallback; 
    import com.google.android.gms.maps.model.BitmapDescriptorFactory; 
    import com.google.android.gms.maps.model.CameraPosition; 
    import com.google.android.gms.maps.model.LatLng; 
    import com.google.android.gms.maps.model.MarkerOptions; 

    public class Maps extends Fragment implements OnMapReadyCallback { 

    private int contentView; 

    @Override 
    public void onMapReady(GoogleMap map) { 
     map.setMapType(GoogleMap.MAP_TYPE_NORMAL); 

     CameraPosition googlePlex = CameraPosition.builder() 
      .target(new LatLng(37.4219999, -122.0862462)) 
      .zoom(16) 
      .bearing(0) 
      .tilt(45) 
      .build(); 

     map.moveCamera(CameraUpdateFactory.newCameraPosition(googlePlex)); 
     map.addMarker(new MarkerOptions() 
      .position(new LatLng(17.440466, 78.496668)) 
      .title("SVIT") 
     .icon(BitmapDescriptorFactory.fromResource(R.mipmap.ic_launcher))); 

     if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 

     return; 
     } 
     map.setMyLocationEnabled(true); 


    } 

    private int checkSelfPermission(String accessFineLocation) { 
     return 0; 
    } 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.fragment_maps); 
     MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map); 
     mapFragment.getMapAsync(this); 
    } 

    public void setContentView(int contentView) { 
    this.contentView = contentView; 
    } 
} 

Message.java (Zweite tab)

import android.app.Activity; 
    import android.content.Intent; 
    import android.os.Bundle; 
    import android.support.v4.app.Fragment; 
    import android.telephony.SmsManager; 
    import android.util.Log; 
    import android.view.LayoutInflater; 
    import android.view.Menu; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.widget.Button; 
    import android.widget.EditText; 
    import android.widget.Toast; 

    import com.package.R; 


    public class Message extends Fragment { 


    private int contentView; 

    public Message() { 

    } 

    Button sendBtn; 
    EditText txtphoneNo; 
    EditText txtMessage; 
    Button clearBtn; 
    Button mapBtn; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     sendBtn = (Button) findViewById(R.id.btnSendSMS); 
     txtphoneNo = (EditText) findViewById(R.id.editText); 
     txtMessage = (EditText) findViewById(R.id.editText2); 
     clearBtn = (Button) findViewById(R.id.btnClearSMS); 
     mapBtn = (Button) findViewById(R.id.btnMaps); 

     sendBtn.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view) { 
      sendSMSMessage(); 
     } 
     }); 
     clearBtn.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v2) { 

       txtMessage.setText(""); 
       txtphoneNo.setText(""); 


      } 
     }); 
     } 

    protected void sendSMSMessage() { 
     Log.i("Send SMS", ""); 
     String phoneNo = txtphoneNo.getText().toString(); 
     String message = txtMessage.getText().toString(); 

     try { 
      SmsManager smsManager = SmsManager.getDefault(); 
      smsManager.sendTextMessage(phoneNo, null, message, null, null); 
      Toast.makeText(getApplicationContext(), "SMS sent.", Toast.LENGTH_LONG).show(); 
     } 

     catch (Exception e) { 
      Toast.makeText(getApplicationContext(), "SMS faild, please try again.", Toast.LENGTH_LONG).show(); 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
    } 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     return inflater.inflate(R.layout.fragment_message, container, false); 
    } 

    public void setContentView(int contentView) { 
     this.contentView = contentView; 
    } 
    } 

Build.Gradle (app)

apply plugin: 'com.android.application' 

    android { 
    compileSdkVersion 23 
    buildToolsVersion '23.0.3' 

    defaultConfig { 
     applicationId "com.package" 
     minSdkVersion 16 
     targetSdkVersion 23 
     versionCode 1 
     versionName "3.0" 
    } 
    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
    } 
} 

dependencies { 
compile fileTree(dir: 'libs', include: ['*.jar']) 
testCompile 'junit:junit:4.12' 
//compile 'com.google.android.gms:play-services:9.2.1' 
//compile 'com.google.android.gms:play-services:8.3.0' 
compile 'com.android.support:appcompat-v7:22.2.1' 
compile 'com.google.android.gms:play-services-appindexing:9.2.1' 
compile 'com.google.android.gms:play-services-maps:9.4.0' 
compile 'com.google.android.gms:play-services-location:9.2.1' 
compile 'com.android.support:design:23.0.1' 
compile 'com.android.support:support-v4:22.2.1' 
} 

build.gradle (Projekt)

// Top-level build file where you can add configuration options common to all sub-projects/modules. 

    buildscript { 
    repositories { 
     jcenter() 
    } 
    dependencies { 
     classpath 'com.android.tools.build:gradle:2.1.2' 

     // NOTE: Do not place your application dependencies here; they belong 
     // in the individual module build.gradle files 
    } 
} 

allprojects { 
    repositories { 
     jcenter() 
    } 
    }  

    task clean(type: Delete) { 
    delete rootProject.buildDir 
} 

Ich habe durch viele Online-Tutorials gefolgt und es funktionierte ohne Material Design, aber nach dem Versuch, Material verwenden Tab zeige an, dass es nicht funktioniert.

Dies sind die Fehler, die ich

Error:(42, 33) error: cannot find symbol method findViewById(int) 
Error:(69, 28) error: cannot find symbol method getApplicationContext() 
Error:(43, 29) error: cannot find symbol method findViewById(int) 
Error:(40, 28) error: cannot find symbol method findViewById(int) 
Error:(41, 33) error: cannot find symbol method findViewById(int) 
Error:(69, 20) error: onCreate(Bundle) in Maps cannot override onCreate(Bundle) in Fragment 
attempting to assign weaker access privileges; was public 
Error:(36, 20) error: onCreate(Bundle) in Message cannot override onCreate(Bundle) in Fragment 
attempting to assign weaker access privileges; was public 
Error:(72, 86) error: inconvertible types 
required: MapFragment 
found: Fragment 
Error:(81, 9) error: cannot find symbol method getMenuInflater() 
Error:(73, 28) error: cannot find symbol method getApplicationContext() 
Error:(78, 5) error: method does not override or implement a method from a supertype 
:app:compileDebugJavaWithJavac FAILED 
Error:Execution failed for task ':app:compileDebugJavaWithJavac'. 

> Compilation failed; see the compiler error output for details. 

Answer 1

Wie @ cricket_007 bin vor darauf hingewiesen, ein Fragment nicht das gleiche wie ein Activity ist. Ich schlage vor, Sie lesen die development guide on fragments, um die Unterschiede zu verstehen.

Als Ausgangspunkt sollte dieses Fragment arbeiten:

public class MessageFragment extends Fragment { 

    private static final String TAG = MessageFragment.class.getName(); 

    Button mSendButton; 
    Button mClearButton; 
    Button mMapButton; 

    EditText mMessageEditText; 
    EditText mPhoneNumberEditText; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.fragment_message, container, false); 

     mSendButton = (Button) view.findViewById(R.id.btnSendSMS); 
     mClearButton = (Button) view.findViewById(R.id.btnClearSMS); 
     mMapButton = (Button) view.findViewById(R.id.btnMaps); 

     mPhoneNumberEditText = (EditText) view.findViewById(R.id.editText); 
     mMessageEditText = (EditText) view.findViewById(R.id.editText2); 

     mSendButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       sendSMSMessage(); 
      } 
     }); 

     mClearButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       mMessageEditText.setText(""); 
       mPhoneNumberEditText.setText(""); 
      } 
     }); 

     return view; 
    } 

    protected void sendSMSMessage() { 
     Log.i(TAG, "Send SMS"); 
     String phoneNo = mPhoneNumberEditText.getText().toString(); 
     String message = mMessageEditText.getText().toString(); 

     try { 
      SmsManager smsManager = SmsManager.getDefault(); 
      smsManager.sendTextMessage(phoneNo, null, message, null, null); 
      Toast.makeText(getContext(), "SMS sent.", Toast.LENGTH_LONG).show(); 
     } catch (IllegalArgumentException exception) { 
      Toast.makeText(getContext(), "SMS failed, please try again.", Toast.LENGTH_LONG).show(); 
      exception.printStackTrace(); 
     } 
    } 

}