如何拖动屏幕上的图像 [英] How to drag images around the screen
本文介绍了如何拖动屏幕上的图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
谁能帮助我如何元的图像，可以在屏幕上拖动C $ C程序？你能给我一个样品code吧。非常感谢。以及如何做一个游戏分数吧。我将AP preciate你的回应。
解决方案
imageView.setOnLongClickListener（新OnLongClickListener（）{ 公共布尔onLongClick（视图v）{
modeEdit = FALSE;
ClipData.Item项目=新ClipData.Item（（CharSequence的）v.getTag（））;
的String [] = MIMETYPES {ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData dragData =新ClipData（v.getTag（）的toString（），MIME类型，项目）; //实例化拖影建设者。
DragShadowBuilder myShadow =新MyDragShadowBuilder（treeBitmap）;
v.startDrag（dragData，//要拖动的数据
myShadow //拖动阴影建设者
treeBitmap，//没有必要使用本地数据
0 //标志（当前未使用，设置为0）
）;
返回true;
}
}）;
这code以下是设置监听拖
MyDragEventListener mDragListen =新MyDragEventListener（）;
这是拖累听众
保护类MyDragEventListener实现OnDragListener { 公共ondrag当布尔（视图V，事件的dragEvent）{
最终诠释行动= event.getAction（）; 开关（动作）{ 案例DragEvent.ACTION_DRAG_STARTED：
Log.d（TAG，FIELD ACTION_DRAG_STARTED）;
如果（event.getClipDescription（）。hasMimeType（ClipDescription.MIMETYPE_TEXT_PLAIN））{
v.invalidate（）;
返回（真）;
}
其他{
返回（假）;
} 案例DragEvent.ACTION_DRAG_ENTERED：
Log.d（TAG，FIELD ACTION_DRAG_ENTERED）;
树presentInMyView = TRUE;
//Toast.makeText（getApplicationContext（），拖动数据进入Toast.LENGTH_LONG）.show（）;
v.invalidate（）;
返回（真）; 案例DragEvent.ACTION_DRAG_LOCATION：
Log.d（TAG，FIELD ACTION_DRAG_LOCATION）;
位X = event.getX（）;
positionY = event.getY（）;
的LayoutParams = v.getLayoutParams（）;
返回（真）; 案例DragEvent.ACTION_DRAG_EXITED：
Log.d（TAG，FIELD ACTION_DRAG_EXITED）;
modeEdit = FALSE;
树presentInMyView = FALSE;
//Toast.makeText（getApplicationContext（），拖动数据退出，Toast.LENGTH_LONG）.show（）;
v.invalidate（）;
返回（真）; 案例DragEvent.ACTION_DROP：
Log.d（TAG，FIELD ACTION_DROP）;
。keyOfTree = event.getClipDescription（）getLabel（）的toString（）;
Log.d（TAG，KEY VALUE =+ keyOfTree）; 最后ImageView的观点=新ImageView的（getApplicationContext（））;
串树宽= getResources（）的getString（R.string.treeWidth）。
字符串treeHeight = getResources（）的getString（R.string.treeHeight）。 RelativeLayout.LayoutParams PARAMS =新RelativeLayout.LayoutParams（的Integer.parseInt（树宽）的Integer.parseInt（treeHeight））;
view.setLayoutParams（PARAMS）;
view.setImageResource（R.drawable.tree1）; //获取图像的宽度和高度：
BitmapFactory.Options O =新BitmapFactory.Options（）;
o.inTargetDensity = DisplayMetrics.DENSITY_DEFAULT;
BMP位图= BitmapFactory.de codeResource（getResources（），R.drawable.tree1，O）;
INT W = bmp.getWidth（）;
INT H = bmp.getHeight（）; Log.d（TAG，宽度=+ W +高度=+ H）;
params.leftMargin =（INT）位X - 瓦; // - W和-h所以拖图像放置在没有鼠标
params.topMargin =（INT）positionY - H; //但如果实际图像是在地图上 view.setVisibility（View.VISIBLE）;
openField.addView（视图）;
LinearLayout.LayoutParams paramsOpenField =新LinearLayout.LayoutParams（openFieldWidth，openFieldHeight）;
openField.setLayoutParams（paramsOpenField）; 尝试{
视频下载（1000）;
}
赶上（InterruptedException的E）{
e.printStackTrace（）;
}
v.invalidate（）;
返回true; 案例DragEvent.ACTION_DRAG_ENDED：
Log.d（TAG，FIELD ACTION_DRAG_ENDED）;
v.invalidate（）;
如果（event.getResult（）及树presentInMyView）{
Log.d（TAG，（X，Y）=（+位X +，+ positionY +））;
INT subSubPlot = 0;
如果（位X＆GT; openField.measuredWidth / 2）{// 3,4
如果（positionY＆GT; openField.measuredHeight / 2）{
subSubPlot = 4;
}
其他{
subSubPlot = 3;
}
}
其他{
如果（positionY＆GT; openField.measuredHeight / 2）{
subSubPlot = 1;
}
其他{
subSubPlot = 2;
}
}
双latitudeOfTree = mValues [0] +（Math.abs（mValues [0] - mValues [2]）/ openField.measuredWidth）*位X;
双longitudeOfTree = mValues [1] +（Math.abs（mValues [1] - mValues [3]）/ openField.measuredHeight）* positionY;
// openField.drawTreeCoordinated（latitudeOfTree，longitudeOfTree，位X，positionY）; 返回true;
}
其他{
返回false;
} 默认：
Log.e（TAG，由OnDragListener收到未知的操作类型。）;
打破;
};
返回false;
}
};
Can anyone help me on how to code program for an image that can be drag around the screen? Can you give me a sample code for it. thanks a lot. And how can i make a game score for it. i will appreciate your response.
解决方案
imageView.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View v) {
modeEdit = false;
ClipData.Item item = new ClipData.Item((CharSequence) v.getTag());
String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData dragData = new ClipData(v.getTag().toString(), mimeTypes, item);
// Instantiates the drag shadow builder.
DragShadowBuilder myShadow = new MyDragShadowBuilder(treeBitmap);
v.startDrag(dragData, // the data to be dragged
myShadow, // the drag shadow builder
treeBitmap, // no need to use local data
0 // flags (not currently used, set to 0)
);
return true;
}
});
This code below is to set the drag listener
MyDragEventListener mDragListen = new MyDragEventListener();
This is the drag listener
protected class MyDragEventListener implements OnDragListener {
public boolean onDrag(View v, DragEvent event) {
final int action = event.getAction();
switch(action) {
case DragEvent.ACTION_DRAG_STARTED:
Log.d(TAG, "FIELD ACTION_DRAG_STARTED");
if (event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
v.invalidate();
return(true);
}
else {
return(false);
}
case DragEvent.ACTION_DRAG_ENTERED:
Log.d(TAG, "FIELD ACTION_DRAG_ENTERED");
treePresentInMyView = true;
//Toast.makeText(getApplicationContext(), "Dragged data entered", Toast.LENGTH_LONG).show();
v.invalidate();
return(true);
case DragEvent.ACTION_DRAG_LOCATION:
Log.d(TAG, "FIELD ACTION_DRAG_LOCATION");
positionX = event.getX();
positionY = event.getY();
layoutParams = v.getLayoutParams();
return(true);
case DragEvent.ACTION_DRAG_EXITED:
Log.d(TAG, "FIELD ACTION_DRAG_EXITED");
modeEdit = false;
treePresentInMyView = false;
//Toast.makeText(getApplicationContext(), "Dragged data exited", Toast.LENGTH_LONG).show();
v.invalidate();
return(true);
case DragEvent.ACTION_DROP:
Log.d(TAG, "FIELD ACTION_DROP");
keyOfTree = event.getClipDescription().getLabel().toString();
Log.d(TAG, "KEY VALUE = "+keyOfTree);
final ImageView view = new ImageView(getApplicationContext());
String treeWidth = getResources().getString(R.string.treeWidth);
String treeHeight = getResources().getString(R.string.treeHeight);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(Integer.parseInt(treeWidth), Integer.parseInt(treeHeight));
view.setLayoutParams(params);
view.setImageResource(R.drawable.tree1);
//to get image width and height:
BitmapFactory.Options o = new BitmapFactory.Options();
o.inTargetDensity = DisplayMetrics.DENSITY_DEFAULT;
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.tree1, o);
int w = bmp.getWidth();
int h = bmp.getHeight();
Log.d(TAG, "width = " + w + " height = " +h);
params.leftMargin = (int) positionX - w;//-w and -h so dragged image placed not at mouse
params.topMargin = (int) positionY - h;// but where actual image is on map
view.setVisibility(View.VISIBLE);
openField.addView(view);
LinearLayout.LayoutParams paramsOpenField = new LinearLayout.LayoutParams(openFieldWidth, openFieldHeight);
openField.setLayoutParams(paramsOpenField);
try {
Thread.sleep(1000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
v.invalidate();
return true;
case DragEvent.ACTION_DRAG_ENDED:
Log.d(TAG, "FIELD ACTION_DRAG_ENDED");
v.invalidate();
if (event.getResult() & treePresentInMyView) {
Log.d(TAG, "(x,y) = ("+positionX+", "+positionY+")");
int subSubPlot = 0;
if (positionX > openField.measuredWidth/2) { //3 and 4
if (positionY > openField.measuredHeight/2) {
subSubPlot = 4;
}
else {
subSubPlot = 3;
}
}
else {
if (positionY > openField.measuredHeight/2) {
subSubPlot = 1;
}
else {
subSubPlot = 2;
}
}
double latitudeOfTree = mValues[0] + (Math.abs(mValues[0] - mValues[2]) / openField.measuredWidth) * positionX;
double longitudeOfTree = mValues[1] + (Math.abs(mValues[1] - mValues[3])/ openField.measuredHeight) * positionY;
// openField.drawTreeCoordinated(latitudeOfTree, longitudeOfTree, positionX, positionY);
return true;
}
else {
return false;
}
default:
Log.e(TAG,"Unknown action type received by OnDragListener.");
break;
};
return false;
}
};
这篇关于如何拖动屏幕上的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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