Why is the picture not inserted in the ImageView on API 21?

I try 4 ways to programmatically insert a picture into ImageView, but nothing comes out. But on API 26 - everything works great. What is my mistake or what is missing here?

Java

public class MainActivity extends AppCompatActivity { ImageView img1,img2,img3,img4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); img1 = (ImageView) findViewById(R.id.img1); img2 = (ImageView) findViewById(R.id.img2); img3 = (ImageView) findViewById(R.id.img3); img4 = (ImageView) findViewById(R.id.img4); //setResource //if(img1 != null) img1.setImageResource(R.drawable.china); //setDrawable img2.setImageDrawable(Drawable.createFromPath("/res/drawable/tokyo1.png")); //setBitmap img3.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.tokyo2)); //Picasso(local) Picasso.get() .load(R.drawable.tokyo1) .into(img4); //Picasso(URI) Picasso.get() .load("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTmG5K1tMdQ4W3G1WlZSfSWfL6jo8E9rS4NTHflXoT1CsF2Na_i") .into(img1); } } 

XML

 <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout 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="com.example.kiril.imgtest4.MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:id="@+id/img1" android:layout_width="1dp" android:layout_height="150dp" android:layout_weight="1" /> <ImageView android:id="@+id/img2" android:layout_width="1dp" android:layout_height="150dp" android:layout_weight="1"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:id="@+id/img3" android:layout_width="1dp" android:layout_height="150dp" android:layout_weight="1"/> <ImageView android:id="@+id/img4" android:layout_width="1dp" android:layout_height="150dp" android:layout_weight="1"/> </LinearLayout> </LinearLayout> </android.support.constraint.ConstraintLayout> 

Having tried different ways and perversions - nothing happened. In general, starting from API 23 - everything starts working fine, and Bitmap, and Picasso with Glide.