Android 多个 ImageView 在触摸上移动

Question

下面是我的 xml 文件。它的名字是 main.xml

---

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <ImageView android:id="@+id/imageView" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:src="@drawable/icon"
        android:scaleType="matrix">
    </ImageView>
    <ImageView android:id="@+id/imageView1" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:src="@drawable/bg_sound"
        android:scaleType="matrix"></ImageView>
</FrameLayout>

---

我的 Java 文件在下面

---

import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

public class Test1Activity extends Activity implements OnTouchListener {
    private static final String TAG = "Touch";
    // These matrices will be used to move and zoom image
    Matrix matrix = new Matrix();
    Matrix savedMatrix = new Matrix();

    // We can be in one of these 3 states

    // Remember some things for zooming
    PointF start = new PointF();
    PointF mid = new PointF();
    float oldDist = 1f;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ImageView view = (ImageView) findViewById(R.id.imageView);
        view.setOnTouchListener(this);

        ImageView view1 = (ImageView) findViewById(R.id.imageView1);
        view1.setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        ImageView view = (ImageView) v;
        // Dump touch event to log

        // Handle touch events here...
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
            savedMatrix.set(matrix);
            start.set(event.getX(), event.getY());
            break;
        case MotionEvent.ACTION_UP:
            savedMatrix.set(matrix);
            //matrix.postRotate(90);

            break;
        case MotionEvent.ACTION_MOVE:
                // ...
                matrix.set(savedMatrix);
                matrix.postTranslate(event.getX() - start.x, event.getY()
                        - start.y);
            break;
        }

        view.setImageMatrix(matrix);
        view.invalidate();
        return true; // indicate event was handled
    }

}

---

我能够实现触摸移动，但由于添加了 2 个图像视图，因此只有最新添加的图像视图是可移动的。

我猜问题是layout_width="fill_parent"，它只会导致触摸时识别出正面图像视图。如果我使用的是layout_width="wrap_content"，那么 imageview 只会在该图像大小的区域中移动并且不可见。

如何解决这个问题？

谢谢，

Answer 1

我几乎解决了你的问题。 因为时间我没有前进 我在您的 main.xml 文件中做了一些更改，如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:orientation="vertical">

        <ImageView android:id="@+id/imageView" android:layout_width="fill_parent"
            android:layout_height="100dp" android:src="@drawable/ic_launcher"
            android:scaleType="matrix"
            android:layout_alignParentTop="true"
            >
        </ImageView>
        <ImageView android:id="@+id/imageView1" android:layout_width="fill_parent"
            android:layout_height="fill_parent" android:src="@drawable/toyota_altis"
            android:scaleType="matrix"
            android:layout_below="@+id/imageView"></ImageView>

</RelativeLayout>

请记住使用您自己的图片并进行适当的更改 我使用的两张图片是

1. ic_launcher
2. toyota_altis

Answer 2

只有一个查看进程onTouch 操作。所以有几个选择：

1) 返回 "false" - 它可以帮助你

2) 使用“wrap_content”，不要使用ImageMatrix。移动图片的左上角

Answer 3

你还可以添加一个切换按钮，点击切换按钮，你可以使用这个将图像视图放在前面

imageView1.bringToFront()/imageView2.bringToFront() 

Answer 4

将以下代码写入您的活动文件。

int windowwidth = getWindowManager().getDefaultDisplay().getWidth();
int windowheight = getWindowManager().getDefaultDisplay().getHeight();


tv1 = (ImageView)findViewById(R.id.image);
tv1.setOnTouchListener(new View.OnTouchListener() {         

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        layoutParams1 = (RelativeLayout.LayoutParams) tv1.getLayoutParams();
        switch(event.getActionMasked())
        {
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_MOVE:
                int x_cord = (int) event.getRawX();
                int y_cord = (int) event.getRawY();
                if (x_cord > windowwidth) {
                    x_cord = windowwidth;
                }
                if (y_cord > windowheight) {
                    y_cord = windowheight;
                }
                layoutParams1.leftMargin = x_cord - 25;
                layoutParams1.topMargin = y_cord - 75;
                tv1.setLayoutParams(layoutParams1);
                break;
            default:
                break;
        }
        return true;
    }
});

tv2 = (ImageView)findViewById(R.id.image1);
tv2.setOnTouchListener(new View.OnTouchListener() {         

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        layoutParams2 = (RelativeLayout.LayoutParams) tv2.getLayoutParams();
        switch(event.getActionMasked())
        {
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_MOVE:
                int x_cord = (int) event.getRawX();
                int y_cord = (int) event.getRawY();
                if (x_cord > windowwidth) {
                    x_cord = windowwidth;
                }
                if (y_cord > windowheight) {
                    y_cord = windowheight;
                }
                layoutParams2.leftMargin = x_cord - 25;
                layoutParams2.topMargin = y_cord - 75;
                tv2.setLayoutParams(layoutParams2);
                break;
            default:
                break;
        }
        return true;
    }
});

main.xml 文件：-

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ImageView android:layout_width="50sp" android:layout_height="50sp"
        android:id="@+id/image" android:src="@drawable/image">
    </ImageView>
    <ImageView android:layout_y="30dip" android:layout_x="118dip"
        android:layout_width="50sp" android:layout_height="50sp" android:id="@+id/image1"
        android:src="@drawable/image1">
    </ImageView>
</RelativeLayout>

有关更多信息，请参阅下面的 SO 答案链接。

Drag & Drop Two Images