Zi 字媒體

示範 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=".MainActivity"> <ImageView android:id="@+id/ig1" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:srcCompat="@mipmap/ic_launcher" /> <TextView android:id="@+id/t1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:layout_marginBottom="8dp" app:layout_constraintBottom_toTopOf="@+id/ig1" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> android.support.constraint.ConstraintLayout> JAVA public class MainActivity extends AppCompatActivity implements View.OnTouchListener{ ImageView ig1; TextView t1; double touchx,touchy; int mx,my; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ig1=(ImageView)findViewById(R.id.ig1); t1=(TextView) findViewById(R.id.t1); ig1.setOnTouchListener(this); } @Override public boolean onTouch(View v, MotionEvent event) { switch (v.getId()) { case R.id.ig1: switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touchx = event.getX(); touchy = event.getY()+210; t1.setText(""+touchy); case MotionEvent.ACTION_MOVE: mx = (int) (event.getRawX() - touchx); my = (int) (event.getRawY() - touchy); ig1.layout(mx,my,ig1.getWidth()+mx,ig1.getHeight()+my); case MotionEvent.ACTION_UP: }} return true; } }