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;
}
}
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