Files for simple Facebook Share button on Android

activity_main.xml

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <com.facebook.share.widget.ShareButton
        android:id="@+id/share_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/share" />
</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.creativerendering.myapplication" >
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:theme="@android:style/Theme.Translucent.NoTitleBar"
            android:label="@string/app_name" />
        <provider android:authorities="com.facebook.app.FacebookContentProviderYOURAPPIDHERE"
            android:name="com.facebook.FacebookContentProvider"
            android:exported="true"/>
    </application>

</manifest>

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.creativerendering.myapplication"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
repositories {
    mavenCentral()
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.0.0'
    compile 'com.facebook.android:facebook-android-sdk:4.0.0'
}

MainActivity.java

package com.creativerendering.myapplication;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.facebook.FacebookSdk;
import com.facebook.share.model.SharePhoto;
import com.facebook.share.model.SharePhotoContent;
import com.facebook.share.widget.ShareButton;

public class MainActivity extends ActionBarActivity {
    // share button
    private ShareButton shareButton;
    //image
    private Bitmap image;
    //counter
    private int counter = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //initialize facebook sdk
        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        //share button
        shareButton = (ShareButton) findViewById(R.id.share_btn);
        shareButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                postPicture();
            }
        });
    }


    @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_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

        public void postPicture() {
            //check counter
            if(counter == 0) {
                //save the screenshot
                View rootView = findViewById(android.R.id.content).getRootView();
                rootView.setDrawingCacheEnabled(true);
                // creates immutable clone of image
                image = Bitmap.createBitmap(rootView.getDrawingCache());
                // destroy
                rootView.destroyDrawingCache();

                //share dialog
                AlertDialog.Builder shareDialog = new AlertDialog.Builder(this);
                shareDialog.setTitle("Share Screen Shot");
                shareDialog.setMessage("Share image to Facebook?");
                shareDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        //share the image to Facebook
                        SharePhoto photo = new SharePhoto.Builder().setBitmap(image).build();
                        SharePhotoContent content = new SharePhotoContent.Builder().addPhoto(photo).build();
                        shareButton.setShareContent(content);
                        counter = 1;
                        shareButton.performClick();
                    }
                });
                shareDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
                shareDialog.show();
            }
            else {
                counter = 0;
                shareButton.setShareContent(null);
            }
        }
}

Strings.xml

<resources>
    <string name="app_name">My Application</string>

    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="facebook_app_id">YOURAPPIDHERE</string>
    <string name="share">Share</string>
</resources>