Shulou(Shulou.com)05/31 Report--

This article mainly introduces the relevant knowledge of "how to move pictures through a single point of touch with Android". The editor shows you the operation process through an actual case. The method of operation is simple and fast, and it is practical. I hope that this article "how to achieve Android through a single touch to move pictures" can help you solve the problem.

Write layout resource files

First prepare a picture and put it in drawable.

The main thing here is to display the picture and set the id (android:scaleType= "fitXY" means the picture is set to its original size)

Write the master layout file

(tag is to see the data when moving pictures.)

Import android.os.Bundle;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.ImageView;import android.widget.LinearLayout;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {private static final String TAG = "move_images_by_touch"; private ImageView ivImages; private LinearLayout root; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState) / / use the layout resource file to set the user interface setContentView (R.layout.activity_main); / / obtain the control instance ivImages = findViewById (R.id.ivImages) through the resource identifier; root = findViewById (R.id.root); / / set the root layout to get the focus root.setFocusable (true) / / Let the layout get the focus root.requestFocus () / / register the touch listener for the root layout Implement the touch listener interface and write the touch event code root.setOnTouchListener (new View.OnTouchListener () {@ Override public boolean onTouch (View view)) MotionEvent event) {/ / perform different actions according to the touch action switch (event.getAction ()) {case MotionEvent.ACTION_DOWN: / / contact press Log.d (TAG, "ACTION_DOWN" + event.getX () + "," + event.getY ()) Break; case MotionEvent.ACTION_MOVE: / / contact Mobile Log.d (TAG, "ACTION_MOVE" + event.getX () + "," + event.getY ()); break Case MotionEvent.ACTION_UP: / / contact release Log.d (TAG, "ACTION_UP" + event.getX () + "," + event.getY ()); break } / / set image control coordinates ivImages.setX (event.getX ()-ivImages.getWidth () / 2); ivImages.setY (event.getY ()-ivImages.getHeight () / 2); return true;// is set to true, three events: down-- > move-- > up execute}}) }}

Effect.

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