Drawable drawable = img.getDrawable();
  if (drawable instanceof BitmapDrawable) 
  {
      BitmapDrawable bitDrawable = (BitmapDrawable) drawable;
          Bitmap bit = bitDrawable.getBitmap();
          int rowBytes = bit.getRowBytes();
          int height = bit.getHeight();
          Log.d("MYLOG","height: "+height+", width: "+bit.getWidth()+", rowBytes: "+rowBytes);
          long memSize = rowBytes * height;
          Log.d("MYLOG", "memSize = " + memSize + "B = " + formatFileSize(memSize)+"MB");
  }

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

public class fragment1 extends Fragment 
{
    private View rootView;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) 
    {
        rootView = inflater.inflate(R.layout.fragment1_layout, container, false);
        Button sendMessage = (Button)rootView.findViewById(R.id.send_btn);
        sendMessage.setOnClickListener(new View.OnClickListener() 
        {
            @Override
            public void onClick(View v) 
            {
                EventBus.getDefault().post(new SomeEvent("Hello this is Fragment1!!"));
            }
        });
        return rootView;
    }
}
> fragment2.java
```java
public class fragment2 extends Fragment 
{
    private View rootView;
    private TextView receiveString;
    private String tmpString;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) 
    {
        rootView = inflater.inflate(R.layout.fragment2_layout, container, false);
        receiveString = (TextView)rootView.findViewById(R.id.textView2);
        return rootView;
    }
    @Subscribe(threadMode = ThreadMode.MainThread)
    public void onEven(SomeEvent event)
    {
        tmpString += event.getMessage() + "\n";
        receiveString.setText(tmpString);
    }
    @Override
    public void onStart() 
    {
        super.onStart();
        EventBus.getDefault().register(this);
    }
    @Override
    public void onStop() 
    {
        super.onStop();
        EventBus.getDefault().unregister(this);
    }
}

// String Request
StringRequest getRequest = new StringRequest("https://jsonplaceholder.typicode.com/posts",
	new Response.Listener<String>()
	{
		@Override
		public void onResponse(String s)
		{
			Log.d("MYLOG","The String: "+s);
		}
	}, new Response.ErrorListener()
	{
		@Override
		public void onErrorResponse(VolleyError volleyError)
		{
			Log.d("MYLOG",volleyError.toString());
		}
	});
	mQueue.add(getRequest);
// JSONObject Request
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET,
	"https://jsonplaceholder.typicode.com/posts",null, new Response.Listener<JSONObject>()
	{
		@Override
		public void onResponse(JSONObject response)
		{
			Log.d("MYLOG",response.toString());
		}
	}, new Response.ErrorListener()
	{
		@Override
		public void onErrorResponse(VolleyError error)
		{
			Log.d("MYLOG",error.toString());
		}
	});
mQueue.add(jsonObjectRequest);

StringRequest questpost = new StringRequest(Request.Method.POST,
	"http://jsonplaceholder.typicode.com/posts",
	new Response.Listener<String>()
	{
		@Override
		public void onResponse(String response)
		{
			Log.d("MYLOG","String: "+response);
		}
	}, new Response.ErrorListener()
	{
		@Override
		public void onErrorResponse(VolleyError error)
		{
			Log.d("MYLOG","ERROR: "+error.toString());
		}
	})
	{
		@Override
		protected Map<String, String> getParams() throws AuthFailureError
		{
			Map<String,String> map = new HashMap<>();
			map.put("title","foo");
			map.put("body","bar");
			map.put("userId","444");
			return map;
		}
	};
mQueue.add(questpost);

StringRequest questpost = new StringRequest(Request.Method.PUT,
	"https://jsonplaceholder.typicode.com/posts/1", 
	new Response.Listener<String>(
	{
		@Override
		public void onResponse(String response)
		{
			Log.d("MYLOG","String: "+response);
		}
	}, new Response.ErrorListener()
	{
		@Override
		public void onErrorResponse(VolleyError error)
		{
			Log.d("MYLOG","ERROR: "+error.toString());
		}
	})
	{
		// Add Header
		@Override
		public Map<String, String> getHeaders() throws AuthFailureError
		{
			Map<String,String> map = new HashMap<>();
			map.put("Content-Type","application/x-www-form-urlencoded");
			return map;
		}
		// Add Params
		@Override
		protected Map<String, String> getParams() throws AuthFailureError
		{
			Map<String,String> map = new HashMap<>();
			map.put("title","SSSSSSSfoo");
			return map;
		}
	};
mQueue.add(questpost);

public interface onItemClickListener
{
	void onItemClick(View view,int position);
}
private onItemClickListener onItemClickListener;
public void setOnItemClickListener(onItemClickListener onItemClickListener)
{
	this.onItemClickListener = onItemClickListener;
}

public class MainActivity extends AppCompatActivity {
Button btn;
PopupWindow popupWindow;
View rootView;
@Override
protected void onCreate(Bundle savedInstanceState)
{
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	btn = (Button) findViewById(R.id.button);
	btn.setOnClickListener(new View.OnClickListener()
	{
		@Override
		public void onClick(View v)
		{
			if (popupWindow == null)
			{
				showPopup();
			} else {
				popupWindow.showAtLocation(rootView, Gravity.BOTTOM, 0, 0);
			}
		}
	});
}
	private void showPopup() {
		// 載入popupwindow至view裡面
		View view = LayoutInflater.from(this).inflate(R.layout.popupwindow_layout, null);
		// 產生一個popupwindow的實例
		popupWindow = new PopupWindow(this);
		// 將view設定給新的popupwindow
		popupWindow.setContentView(view);
		// 設定popupwindow的高度和寬度
		popupWindow.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
		popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
		// 取得主layout
		rootView = LayoutInflater.from(this).inflate(R.layout.activity_main, null);
		// 顯示popupwindow至主layout (顯示於底部)
		popupWindow.showAtLocation(rootView, Gravity.BOTTOM, 0, 0);
		// 設定為false則不響應除了popupwindow以外的touch事件
		popupWindow.setOutsideTouchable(false);
	}
}

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.MyViewHolder> {
public RecycleViewAdapter(Context context) {
	this.context = context;
}
// 這部份主要寫綁定layout的程式
@Override
public RecycleViewAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	return null;
}
// 上面綁定layout後，在這裡實作物件功能
@Override
public void onBindViewHolder(final RecycleViewAdapter.MyViewHolder holder, final int position) {
}
// 執行的總次數
@Override
public int getItemCount() {
	return 0;
}
// 自己寫ViewHolder來綁定控件
class MyViewHolder extends RecyclerView.ViewHolder {
	public MyViewHolder(View view) {
		super(view);
	}
}

class MyViewHolder extends RecyclerView.ViewHolder {
	TextView tv;
	public MyViewHolder(View view) {
		super(view);
		tv = (TextView) view.findViewById(R.id.textView2);
	}
}

// 進行RecyclerView物件綁定
RecyclerView mRecyclerView = (RecyclerView) view.findViewById(R.id.recycleview);
// 棋盤式
//RecyclerView.LayoutManager layoutManager = new GridLayoutManager(this,4);
// 瀑布式
//RecyclerView.LayoutManager layoutManager = new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL);
// 線性 ( 這裡用線性做範例 )
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
RecycleViewAdapter mAdapter = new RecycleViewAdapter(this);
mRecyclerView.setAdapter(mAdapter);

Button btn2;
int values = 1;
boolean isRunning = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	btn2 = (Button) findViewById(R.id.button2);
	btn2.setOnClickListener(new View.OnClickListener()
	{
		@Override
		public void onClick(View v)
		{
			if (isrunning)
			{
				isRunning = false;
				nhandler.removeCallbacks(runnable);
			} else {
				isRunning = true;
				nhandler.post(runnable);
			}
		}
	});
}
Handler nhandler = new Handler();
Runnable runnable = new Runnable() 
{
	@Override
	public void run()
	{
		if (values < 190)
		{
			float fff = (float) (Math.sin((double) values * 0.1) * 50) + btn2.getTop();
			btn2.setY(fff);
			values++;
		} else {
			values = 1;
		}
		nhandler.postDelayed(this, 10);
	}
};

Handler nhandler = new Handler();
Runnable runnable = new Runnable() {
	@Override
	public void run()
	{
		if (values < 190)
		{
			float fff = (float) (Math.sin((double) values * 0.1) * 50) + btn2.getTop();
			float ttt = (float) (Math.tan((double) values * 0.01) * 50);
			btn2.setY(fff);
			btn2.setX(ttt);
			values++;
		} else {
			values = 1;
		}
		nhandler.postDelayed(this, 10);
	}
};