Добавить изображение на панель инструментов в android

Создать макет панели инструментов

app_toolbar.xml

<?xml version = "1.0" encoding = "utf-8"?>
<RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:id = "@+id/toolbar"
    android:layout_width = "match_parent"
    android:layout_height = "?attr/actionBarSize"
    android:background = "@color/app_color">


    <RelativeLayout
        android:id = "@+id/rr_title"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:layout_centerVertical = "true"
        android:gravity = "center"
        android:src = "@mipmap/ic_launcher">

        <RelativeLayout
            android:id = "@+id/rr_toolbar_left"
            android:layout_width = "50dp"
            android:layout_height = "match_parent"
            android:layout_alignParentLeft = "true"
            android:layout_centerVertical = "true"
            android:paddingLeft = "10dp"
            android:paddingRight = "10dp"
            android:src = "@mipmap/ic_launcher">

            <ImageView
                android:id = "@+id/iv_toolbar_left"
                android:layout_width = "wrap_content"
                android:layout_height = "wrap_content"
                android:layout_centerVertical = "true"
                android:padding = "8dp"
                android:visibility = "visible" />
        </RelativeLayout>

        <TextView
            android:id = "@+id/toolbar_title"
            android:layout_width = "match_parent"
            android:layout_height = "wrap_content"
            android:layout_centerInParent = "true"
            android:layout_centerVertical = "true"
            android:layout_marginTop = "5dp"
            android:ellipsize = "end"
            android:gravity = "center"
            android:text = "EXAMPLE"
            android:paddingRight = "5dp"
            android:singleLine = "true"
            android:textColor = "@android:color/white"
            android:textSize = "22sp" />

        <RelativeLayout
            android:id = "@+id/rr_toolbar_right"
            android:layout_width = "50dp"
            android:layout_height = "match_parent"
            android:layout_alignParentRight = "true"
            android:layout_centerVertical = "true"
            android:paddingLeft = "10dp"
            android:paddingRight = "20dp">

            <ImageView
                android:id = "@+id/iv_toolbar_right"
                android:layout_width = "wrap_content"
                android:layout_height = "wrap_content"
                android:layout_alignParentRight = "true"
                android:layout_centerVertical = "true"
                android:visibility = "visible" />
        </RelativeLayout>
    </RelativeLayout>
</RelativeLayout>

main_activity.xml

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:id = "@+id/ll_login_"
    android:layout_width = "fill_parent"
    android:layout_height = "fill_parent"
    android:background = "@color/white"
    android:orientation = "vertical">

    <LinearLayout
        android:id = "@+id/ll_toolbar_header_signup"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content">

        <include layout = "@layout/app_toolbar" />
    </LinearLayout>


    <LinearLayout
        android:layout_width = "match_parent"
        android:layout_height = "match_parent"
        android:layout_alignParentLeft = "true"
        android:layout_alignParentStart = "true"
        android:layout_alignParentTop = "true"
        android:background = "@color/white"
        android:orientation = "vertical">

        <LinearLayout
            android:id = "@+id/ll_main_fragment"
            android:layout_width = "match_parent"
            android:layout_height = "0dp"
            android:layout_weight = "8.5"
            android:orientation = "vertical">

            <com.baoyz.widget.PullRefreshLayout
                android:id = "@+id/swipeRefreshLayout"
                android:layout_width = "match_parent"
                android:layout_height = "match_parent"
                android:layout_above = "@+id/adViewContainer">


                <android.support.v7.widget.RecyclerView
                    android:id = "@+id/rvNewsList"
                    android:layout_width = "match_parent"
                    android:layout_height = "match_parent"
                    android:layout_gravity = "center"
                    android:background = "@color/white"
                    android:scrollbarSize = "0dp"
                    android:scrollbars = "vertical"
                    android:visibility = "gone" />

            </com.baoyz.widget.PullRefreshLayout>
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

MainActivity.Java

Set backButton and Center Toolbar Text Programetically like this

public class MainActivityextends Activity i {

    private ImageView iv_toolbar_left = null, iv_toolbar_right = null;
    private TextView toolbar_title = null;
    private RelativeLayout rr_toolbar_left = null, rr_toolbar_right = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        overridePendingTransition(R.anim.slid_in_right, R.anim.slid_out_left);
        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_edit_case);

        iv_toolbar_left = (ImageView) findViewById(R.id.iv_toolbar_left);
        iv_toolbar_left.setImageResource(R.mipmap.ic_back);
        iv_toolbar_left.setVisibility(View.VISIBLE);
        iv_toolbar_right = (ImageView) findViewById(R.id.iv_toolbar_right);
        toolbar_title = (TextView) findViewById(R.id.toolbar_title);
        toolbar_title.setText("Edit Status");
        rr_toolbar_left = (RelativeLayout) findViewById(R.id.rr_toolbar_left);
        rr_toolbar_right = (RelativeLayout) findViewById(R.id.rr_toolbar_right);
        rr_toolbar_left.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                overridePendingTransition(R.anim.slid_in_left, R.anim.slid_out_right);
                finish();
            }
        });

    }
}

Надеюсь, это поможет вам.