Java 拖航及；在屏幕上移动位图
我尝试过实现一种在屏幕上拖放位图的方法。当卡片是imageView并且在XML文件中时，我尝试的方法是有效的，但是我改变了我的方法，我只是在调用draw方法时将位图加载到屏幕上的矩形中 有人能告诉我实现拖放加载到屏幕上的位图的最佳方法吗？提前谢谢 我的代码： Play Screen类：（其中位图加载并绘制到屏幕上） 编辑： 有效的方法是使用以下方法：Java 拖航及；在屏幕上移动位图,java,android,bitmap,drag-and-drop,Java,Android,Bitmap,Drag And Drop,我尝试过实现一种在屏幕上拖放位图的方法。当卡片是imageView并且在XML文件中时，我尝试的方法是有效的，但是我改变了我的方法，我只是在调用draw方法时将位图加载到屏幕上的矩形中 有人能告诉我实现拖放加载到屏幕上的位图的最佳方法吗？提前谢谢 我的代码： Play Screen类：（其中位图加载并绘制到屏幕上） 编辑： 有效的方法是使用以下方法： RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParam
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(500, 150);
cardImage.setLayoutParams(layoutParams);
cardImage.setOnTouchListener(new ChoiceTouchListener());
//load hazard playing card
Bitmap hazardCard = loadBitmap(assetManager, "img/hazard_card.jpg");
ImageView hazardCardimageView = (ImageView) view.findViewById(R.id.hazardCardImageView);
if (hazardCard != null) {
hazardCardimageView.setImageBitmap(hazardCard);
}
private final class ChoiceTouchListener implements View.OnTouchListener {
public boolean onTouch(View view, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lparams = (RelativeLayout.LayoutParams) view.getLayoutParams();
_xDelta = X - lparams.leftMargin;
_yDelta = Y - lparams.topMargin;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = 0b11111111111111111111111100000110;
layoutParams.bottomMargin = 0b11111111111111111111111100000110;
view.setLayoutParams(layoutParams);
break;
}
rootLayout.invalidate();
return true;
}
}
import android.app.Activity;
import android.app.FragmentManager;
import android.graphics.PointF;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import com.example.llave_000.shootout.world.DemoGame;
import com.example.llave_000.shootout.BaseGestureDetector;
import com.example.llave_000.shootout.MoveGestureDetector;
import android.widget.ImageView;
public class MainActivity extends Activity implements View.OnTouchListener {
private float mScaleFactor = 1.0f;
private float mRotationDegrees = 0.f;
private float mFocusX = 0.f;
private float mFocusY = 0.f;
private ImageView cardImage1;
private ViewGroup rootLayout;
public View view;
private MoveGestureDetector mMoveDetector;
private ScaleGestureDetector mScaleDetector;
/* private RotationGestureDetector mRotateDetector;
private MoveGestureDetector mMoveDetector;*/
/**
* Game fragment instance
*/
private Game mGame;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//ImageView hazardCardImageView = (ImageView) view.findViewById(R.id.hazardCardImageView);
cardImage1 = (ImageView)findViewById(R.id.hazardCardImageView);
// Setup Gesture Detectors
mMoveDetector = new MoveGestureDetector(getApplicationContext(), new MoveListener());
//mScaleDetector = new ScaleGestureDetector(getApplicationContext(), new ScaleListener());
/*mRotateDetector = new RotationGestureDetector(getApplicationContext(), new RotateListener());
mMoveDetector = new MoveGestureDetector(getApplicationContext(), new MoveListener());*/
// Setup the window as suitable for a game, namely: full screen
// with no title and a request to keep the screen on. The changes
// are made before any content is inflated.
Window window = getWindow();
window.requestFeature(Window.FEATURE_NO_TITLE);
window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
// Set the content view to use a simple frame layout
setContentView(R.layout.activity_main);
// Add in the main game fragment..
FragmentManager fm = getFragmentManager();
// MenuScreen menuScreen = (MenuScreen)fm.findFragmentById(R.id.activity_main_id);
mGame = (Game)fm.findFragmentById(R.id.activity_main_id);
if (mGame == null) {
mGame = new DemoGame(); //not sure if correct
fm.beginTransaction().add(R.id.activity_main_id, mGame)
.commit();
}
// Add in the main game fragment
/* if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.activity_main_id, new MenuScreen()).commit();
}*/
}
public boolean onTouch(View view, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
mMoveDetector.onTouchEvent(event);
/* mRotateDetector.onTouchEvent(event);
mMoveDetector.onTouchEvent(event);
*/
// Mmmmmhhhagic!!!
// with: mScaleFactor, mRotationDegrees, mFocusX and mFocusY
return true; // indicate event was handled
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor(); // scale change since previous event
return true;
}
}
/* private class RotateListener extends RotateGestureDetector.SimpleOnRotateGestureListener {
@Override
public boolean onRotate(RotateGestureDetector detector) {
mRotationDegrees -= detector.getRotationDegreesDelta();
return true;
}
}
*/
private class MoveListener extends MoveGestureDetector.SimpleOnMoveGestureListener {
@Override
public boolean onMove(MoveGestureDetector detector) {
PointF d = detector.getFocusDelta();
mFocusX += d.x;
mFocusY += d.y;
return true;
}
}
@Override
public void onBackPressed() {
// If the fragment does not consume the back event then
// trigger the default behaviour
if(!mGame.onBackPressed())
super.onBackPressed();
}
/* public boolean onTouchEvent(MotionEvent me) {
if (me.getAction() == MotionEvent.ACTION_DOWN) {
//code in here to take me to new screen with match attax background
//with new screen displaying a card. then work on being able to move that card.
//playButtonY -= 20;
}*/
// playButton.setY(playButtonY);
//code in here to take me to new screen with match attax background
//with new screen displaying a card. then work on being able to move that card.
//return true;
}
..看到了吗？我尝试了一些答案，主要是一个使用图层类和视口类的答案，但出现了很多错误。很多错误？@psink，我实现了视口类。导入必要的包后的前两个错误：“无法解析符号图层0”和“无法解析符号MoveGestureDetector”。。与RotateGestureDetector相同。关于我的具体比赛，我很难遵循这个答案。我刚开始使用安卓系统，所以不熟悉这些东西。我了解绘制位图和与之相关的矩形，以便将它们显示在屏幕上，但之后就不那么了解了。我的答案是：
，借助android手势检测器https://github.com/pskink/android-gesture-detectors […]“android手势检测器RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(500, 150);
cardImage.setLayoutParams(layoutParams);
cardImage.setOnTouchListener(new ChoiceTouchListener());
//load hazard playing card
Bitmap hazardCard = loadBitmap(assetManager, "img/hazard_card.jpg");
ImageView hazardCardimageView = (ImageView) view.findViewById(R.id.hazardCardImageView);
if (hazardCard != null) {
hazardCardimageView.setImageBitmap(hazardCard);
}
private final class ChoiceTouchListener implements View.OnTouchListener {
public boolean onTouch(View view, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lparams = (RelativeLayout.LayoutParams) view.getLayoutParams();
_xDelta = X - lparams.leftMargin;
_yDelta = Y - lparams.topMargin;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
layoutParams.leftMargin = X - _xDelta;
layoutParams.topMargin = Y - _yDelta;
layoutParams.rightMargin = 0b11111111111111111111111100000110;
layoutParams.bottomMargin = 0b11111111111111111111111100000110;
view.setLayoutParams(layoutParams);
break;
}
rootLayout.invalidate();
return true;
}
}
import android.app.Activity;
import android.app.FragmentManager;
import android.graphics.PointF;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import com.example.llave_000.shootout.world.DemoGame;
import com.example.llave_000.shootout.BaseGestureDetector;
import com.example.llave_000.shootout.MoveGestureDetector;
import android.widget.ImageView;
public class MainActivity extends Activity implements View.OnTouchListener {
private float mScaleFactor = 1.0f;
private float mRotationDegrees = 0.f;
private float mFocusX = 0.f;
private float mFocusY = 0.f;
private ImageView cardImage1;
private ViewGroup rootLayout;
public View view;
private MoveGestureDetector mMoveDetector;
private ScaleGestureDetector mScaleDetector;
/* private RotationGestureDetector mRotateDetector;
private MoveGestureDetector mMoveDetector;*/
/**
* Game fragment instance
*/
private Game mGame;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//ImageView hazardCardImageView = (ImageView) view.findViewById(R.id.hazardCardImageView);
cardImage1 = (ImageView)findViewById(R.id.hazardCardImageView);
// Setup Gesture Detectors
mMoveDetector = new MoveGestureDetector(getApplicationContext(), new MoveListener());
//mScaleDetector = new ScaleGestureDetector(getApplicationContext(), new ScaleListener());
/*mRotateDetector = new RotationGestureDetector(getApplicationContext(), new RotateListener());
mMoveDetector = new MoveGestureDetector(getApplicationContext(), new MoveListener());*/
// Setup the window as suitable for a game, namely: full screen
// with no title and a request to keep the screen on. The changes
// are made before any content is inflated.
Window window = getWindow();
window.requestFeature(Window.FEATURE_NO_TITLE);
window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
// Set the content view to use a simple frame layout
setContentView(R.layout.activity_main);
// Add in the main game fragment..
FragmentManager fm = getFragmentManager();
// MenuScreen menuScreen = (MenuScreen)fm.findFragmentById(R.id.activity_main_id);
mGame = (Game)fm.findFragmentById(R.id.activity_main_id);
if (mGame == null) {
mGame = new DemoGame(); //not sure if correct
fm.beginTransaction().add(R.id.activity_main_id, mGame)
.commit();
}
// Add in the main game fragment
/* if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.activity_main_id, new MenuScreen()).commit();
}*/
}
public boolean onTouch(View view, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
mMoveDetector.onTouchEvent(event);
/* mRotateDetector.onTouchEvent(event);
mMoveDetector.onTouchEvent(event);
*/
// Mmmmmhhhagic!!!
// with: mScaleFactor, mRotationDegrees, mFocusX and mFocusY
return true; // indicate event was handled
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor(); // scale change since previous event
return true;
}
}
/* private class RotateListener extends RotateGestureDetector.SimpleOnRotateGestureListener {
@Override
public boolean onRotate(RotateGestureDetector detector) {
mRotationDegrees -= detector.getRotationDegreesDelta();
return true;
}
}
*/
private class MoveListener extends MoveGestureDetector.SimpleOnMoveGestureListener {
@Override
public boolean onMove(MoveGestureDetector detector) {
PointF d = detector.getFocusDelta();
mFocusX += d.x;
mFocusY += d.y;
return true;
}
}
@Override
public void onBackPressed() {
// If the fragment does not consume the back event then
// trigger the default behaviour
if(!mGame.onBackPressed())
super.onBackPressed();
}
/* public boolean onTouchEvent(MotionEvent me) {
if (me.getAction() == MotionEvent.ACTION_DOWN) {
//code in here to take me to new screen with match attax background
//with new screen displaying a card. then work on being able to move that card.
//playButtonY -= 20;
}*/
// playButton.setY(playButtonY);
//code in here to take me to new screen with match attax background
//with new screen displaying a card. then work on being able to move that card.
//return true;
}