Tag: android

Android Inherit Styles

/res/values/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>


    <style name="Style_One">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">wrap_content</item>
    </style>

    <style name="Style_One.Style_Two">
        <item name="android:textColor">@android:color/holo_orange_light</item>
    </style>
</resources>

MainActivity.java

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="iterator.ir.a040.MainActivity">


    <TextView
        android:id="@+id/textView"
        style="@style/Style_One"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="55dp"
        android:gravity="center"
        android:text="Style One"
        android:textAppearance="@style/TextAppearance.AppCompat.Large" />

    <TextView
        android:id="@+id/textView2"
        style="@style/Style_One.Style_Two"
        android:layout_alignEnd="@+id/textView"
        android:layout_alignRight="@+id/textView"
        android:layout_below="@+id/textView"
        android:layout_marginTop="40dp"
        android:gravity="center"
        android:text="Style Two"
        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
</RelativeLayout>

References
https://github.com/mhdr/AndroidSamples/tree/master/040

Android Add Up Button into Action Bar

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="iterator.ir.a039">

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ChildOneActivity" android:parentActivityName=".MainActivity"/>
        <activity android:name=".ChildTwoActivity" android:parentActivityName=".MainActivity"/>
    </application>

</manifest>

ChildOneActivity.java

public class ChildOneActivity extends AppCompatActivity {

    Button buttonOpenChildTwo;

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        buttonOpenChildTwo= (Button) findViewById(R.id.buttonOpenChildTwo);
        buttonOpenChildTwo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(getBaseContext(),ChildTwoActivity.class);
                startActivity(intent);
            }
        });
    }
}

ChildTwoActivity.java

public class ChildTwoActivity extends AppCompatActivity {

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/039

Android Adding the Action Bar

/res/menu/main_menu.xml

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

    <item
        android:id="@+id/itemShare"
        android:icon="@drawable/ic_share_white_24dp"
        android:title="@string/share"
        app:showAsAction="always" />
    <item
        android:id="@+id/itemSearch"
        android:icon="@drawable/ic_share_white_24dp"
        android:title="@string/search" />
</menu>

MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        ActionBar actionBar=getSupportActionBar();

        actionBar.setLogo(R.drawable.ic_android_white_24dp);
        actionBar.setDisplayUseLogoEnabled(true);
        actionBar.setDisplayShowHomeEnabled(true);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main_menu,menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId())
        {
            case R.id.itemSearch:
                Toast.makeText(getBaseContext(),"Search",Toast.LENGTH_LONG).show();
                break;
            case R.id.itemShare:
                Toast.makeText(getBaseContext(),"Share",Toast.LENGTH_LONG).show();
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/038

Android Forcing an App Chooser

MainActivity.java

package iterator.ir.appc;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button buttonShow;

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

        buttonShow= (Button) findViewById(R.id.buttonShow);

        buttonShow.setOnClickListener(buttonShow_OnClickListener);
    }

    View.OnClickListener buttonShow_OnClickListener=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent("ir.iterator.AppA.MessageActivity");

            Intent chooser=Intent.createChooser(intent,"APP Selector");

            startActivity(chooser);
        }
    };
}

References
https://github.com/mhdr/AndroidSamples/tree/master/037

Android Explicit and Implicit Intent

AppA MainActivity.java

package iterator.ir.appa;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button buttonShow;

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

        buttonShow= (Button) findViewById(R.id.buttonShow);

        buttonShow.setOnClickListener(buttonShow_OnClickListener);
    }

    View.OnClickListener buttonShow_OnClickListener=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(getBaseContext(),MessageActivity.class);
            startActivity(intent);
        }
    };
}

AppA AndroidManifest.xml

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

    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MessageActivity">
            <intent-filter>
                <action android:name="ir.iterator.AppA.MessageActivity" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

AppB MainActivity.java

package iterator.ir.appb;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button buttonShow;

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

        buttonShow= (Button) findViewById(R.id.buttonShow);
        buttonShow.setOnClickListener(buttonShow_OnClickListener);

    }

    View.OnClickListener buttonShow_OnClickListener=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent("ir.iterator.AppA.MessageActivity");
            startActivity(intent);
        }
    };
}

References
https://github.com/mhdr/AndroidSamples/tree/master/036

Android Add a Fragment to an Activity using XML

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="iterator.ir.a033.MainActivity"
    android:orientation="vertical">

    <fragment
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:name="iterator.ir.a033.FirstFragment"
        android:id="@+id/fragment1"
        tools:layout="@layout/fragment_first" />

    <View
        android:layout_width="match_parent"
        android:layout_height="20dp" />

    <fragment
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:name="iterator.ir.a033.SecondFragment"
        android:id="@+id/fragment2"
        tools:layout="@layout/fragment_second" />

</LinearLayout>

References
https://github.com/mhdr/AndroidSamples/tree/master/033

Android Communication between two Fragments

FirstFragment.java

public class FirstFragment extends Fragment {

    Button buttonSend;
    EditText editTextName;

    private OnFragment1InteractionListener mListener;

    public FirstFragment() {

    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view= inflater.inflate(R.layout.fragment_first, container, false);

        buttonSend= (Button) view.findViewById(R.id.buttonSend);
        editTextName= (EditText) view.findViewById(R.id.editTextName);

        buttonSend.setOnClickListener(onClickListener);

        return view;
    }

    View.OnClickListener onClickListener=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String name=editTextName.getText().toString();
            onButtonPressed(name);
        }
    };

    public void onButtonPressed(String name) {
        if (mListener != null) {
            mListener.onFragment1ButtonClicked(name);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragment1InteractionListener) {
            mListener = (OnFragment1InteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragment1InteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragment1InteractionListener {
        void onFragment1ButtonClicked(String name);
    }
}

SecondFragment.java

public class SecondFragment extends Fragment {

    TextView textViewMessage;

    public SecondFragment() {

    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View  view= inflater.inflate(R.layout.fragment_second, container, false);

        textViewMessage= (TextView) view.findViewById(R.id.textViewMessage);

        return view;
    }

    public void setTextViewMessage(String name)
    {
        textViewMessage.setText("Hello " + name);
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity implements FirstFragment.OnFragment1InteractionListener{

    RelativeLayout container1;
    RelativeLayout container2;

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

        container1= (RelativeLayout) findViewById(R.id.relativeLayoutContainer1);
        container2= (RelativeLayout) findViewById(R.id.relativeLayoutContainer2);

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();


        FirstFragment firstFragment=new FirstFragment();
        SecondFragment secondFragment=new SecondFragment();

        transaction.add(R.id.relativeLayoutContainer1,firstFragment);
        transaction.add(R.id.relativeLayoutContainer2,secondFragment);

        transaction.commit();
    }

    @Override
    public void onFragment1ButtonClicked(String name) {
        SecondFragment fragment= (SecondFragment) getSupportFragmentManager().findFragmentById(R.id.relativeLayoutContainer2);
        fragment.setTextViewMessage(name);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/032

Android Fragment Activity Communication

ChangeColorFragment.java

public class ChangeColorFragment extends Fragment {

    private OnChangeColorFragmentInteractionListener mListener;
    RadioGroup radioGroupColors;

    public ChangeColorFragment() {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view= inflater.inflate(R.layout.fragment_change_color, container, false);

        radioGroupColors= (RadioGroup) view.findViewById(R.id.radioGroupColors);

        radioGroupColors.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                onColorChanged(checkedId);
            }
        });

        return view;
    }

    public void onColorChanged(int id) {
        if (mListener != null) {
            mListener.onChangeColorFragmentInteraction(id);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnChangeColorFragmentInteractionListener) {
            mListener = (OnChangeColorFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnChangeColorFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnChangeColorFragmentInteractionListener {
        void onChangeColorFragmentInteraction(int id);
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity implements ChangeColorFragment.OnChangeColorFragmentInteractionListener{

    RelativeLayout layout;

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

        layout= (RelativeLayout) findViewById(R.id.activity_main);

        FragmentTransaction transaction= getSupportFragmentManager().beginTransaction();

        ChangeColorFragment changeColorFragment=new ChangeColorFragment();
        transaction.add(R.id.relativeLayoutFragmentContainer,changeColorFragment);

        transaction.commit();
    }

    @Override
    public void onChangeColorFragmentInteraction(int id) {
        switch (id)
        {
            case R.id.radioButtonRed:
                layout.setBackgroundColor(getResources().getColor(R.color.red));
                break;
            case R.id.radioButtonBlue:
                layout.setBackgroundColor(getResources().getColor(R.color.blue));
                break;
        }
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/031

Android Working with RadioGroup

activity_main.xml

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="iterator.ir.a030.MainActivity">

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <RadioButton
            android:text="Red"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/radioButtonRed" />

        <RadioButton
            android:text="Blue"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/radioButtonBlue" />
    </RadioGroup>
</RelativeLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {


    RadioGroup radioGroup;
    RelativeLayout layout;

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

        layout= (RelativeLayout) findViewById(R.id.activity_main);
        radioGroup= (RadioGroup) findViewById(R.id.radioGroup);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId)
                {
                    case R.id.radioButtonRed:
                        layout.setBackgroundColor(getResources().getColor(R.color.red));
                        break;
                    case R.id.radioButtonBlue:
                        layout.setBackgroundColor(getResources().getColor(R.color.blue));
                        break;
                }
            }
        });
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/030

Android Add a Fragment to an Activity at Runtime

activity_main.xml

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="iterator.ir.a029.MainActivity">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="22dp"
        android:id="@+id/textView"
        android:text="@string/fragment_demo"
        android:textAppearance="@style/TextAppearance.AppCompat.Large" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignLeft="@+id/textView"
        android:layout_alignStart="@+id/textView"
        android:layout_marginTop="30dp"
        android:id="@+id/relativeLayoutFragment">

    </RelativeLayout>

    <Button
        android:text="First"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="36dp"
        android:layout_marginStart="36dp"
        android:layout_marginBottom="23dp"
        android:id="@+id/buttonFirstFragment" />

    <Button
        android:text="Second"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/buttonFirstFragment"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginRight="39dp"
        android:layout_marginEnd="39dp"
        android:id="@+id/buttonSecondFragment" />
</RelativeLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Button buttonFirst;
    Button buttonSecond;

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

        final FragmentManager fragmentManager=getSupportFragmentManager();

        final FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();

        FirstFragment firstFragment=new FirstFragment();

        fragmentTransaction.add(R.id.relativeLayoutFragment,firstFragment);

        fragmentTransaction.commit();

        buttonFirst= (Button) findViewById(R.id.buttonFirstFragment);
        buttonSecond= (Button) findViewById(R.id.buttonSecondFragment);

        buttonFirst.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final FragmentManager fragmentManager=getSupportFragmentManager();

                final FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();

                FirstFragment firstFragment=new FirstFragment();

                fragmentTransaction.replace(R.id.relativeLayoutFragment,firstFragment);

                fragmentTransaction.commit();
            }
        });

        buttonSecond.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final FragmentManager fragmentManager=getSupportFragmentManager();

                final FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();

                SecondFragment secondFragment=new SecondFragment();

                fragmentTransaction.replace(R.id.relativeLayoutFragment,secondFragment);

                fragmentTransaction.commit();
            }
        });
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/029