android - 带有触摸事件的移动图像

Question

当我们从左到右和从右到左移动(触摸)图像时，我需要一个示例代码。请帮我。

问候，
脉轮

Answer 1

试试这个代码...

这是你的主要 Activity 类

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;
import android.widget.RelativeLayout;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity {

    ImageView imageView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView)findViewById(R.id.imageView1);

        imageView.setOnTouchListener(new OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                int eid = event.getAction();
                switch (eid) {
                case MotionEvent.ACTION_MOVE:

                    RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
                    int x = (int) event.getRawX();
                    int y = (int) event.getRawY();
                    mParams.leftMargin = x-50;
                    mParams.topMargin = y-50;
                    imageView.setLayoutParams(mParams);


                    break;

                default:
                    break;
                }
                return true;
            }
        });
    }




}

ma​​in.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="126dp"
        android:layout_marginTop="168dp"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>