我最近开始在布局上使用画布，因为我可以在后台使用动画。但是，我想在用户单击按钮后启动一个新活动。这是迄今为止的代码......
public class GFX extends Activity implements View.OnTouchListener {
MyBringBack ourSurfaceView;
Paint title, play, options;
float x, y, sX, sY, fX, fY, dX, dY, aniX, aniY, scaledX, scaledY, changingRedX, changingYellowX, changingPurpleX, changingGreenX, whereIsRedXY, whereIsYellowXY, whereIsGreenXY, whereIsPurpleXY;
int whereIsRedY, redXThing, whereIsYellowY, whereIsGreenY, whereIsPurpleY, yellowXThing, greenXThing, purpleXThing, firstRun;
Bitmap green, yellow, red, purple, plus, redFixed, yellowFixed, greenFixed, purpleFixed, titleTest, playTest, playFixed;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ourSurfaceView = new MyBringBack(this);
ourSurfaceView.setOnTouchListener(this);
x = 0;
y = 0;
sX = 0;
sY = 0;
fX = 0;
fY = 0;
Context ctx;
firstRun = 0;
dX = dY = aniX = aniY = scaledX = scaledY = redXThing = 0;
ctx = this;
green = BitmapFactory.decodeResource(getResources(), R.drawable.greenhairedpotatoblack);
yellow = BitmapFactory.decodeResource(getResources(), R.drawable.yellowhairedpotatoblack);
red = BitmapFactory.decodeResource(getResources(), R.drawable.redhairedpotatoblack);
purple = BitmapFactory.decodeResource(getResources(), R.drawable.purplehairedpotatoblack);
plus = BitmapFactory.decodeResource(getResources(), R.drawable.plus);
titleTest = BitmapFactory.decodeResource(getResources(), R.drawable.title);
playTest = BitmapFactory.decodeResource(getResources(), R.drawable.play);
setContentView(ourSurfaceView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_gfx, menu);
return true;
}
@Override
protected void onPause() {
super.onPause();
ourSurfaceView.pause();
}
@Override
protected void onResume() {
super.onResume();
ourSurfaceView.resume();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
try {
Thread.sleep(1000/60);
} catch (InterruptedException e) {
e.printStackTrace();
}
x = event.getX();
y = event.getY();
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
//if(y > play.getTextBounds("Play", );)
break;
}
return true;
}
public class MyBringBack extends SurfaceView implements Runnable {
SurfaceHolder ourHolder;
Thread ourThread = null;
boolean isRunning = false;
public MyBringBack(Context context) {
super(context);
ourHolder = getHolder();
}
public void pause(){
isRunning = false;
while(true){
try {
ourThread.join();
} catch (InterruptedException e){
e.printStackTrace();
}
break;
}
ourThread = null;
}
public void resume(){
isRunning = true;
ourThread = new Thread(this);
ourThread.start();
}
@Override
public void run() {
while(isRunning){
if(!ourHolder.getSurface().isValid())
continue;
Canvas canvas = ourHolder.lockCanvas();
canvas.drawColor(Color.BLACK);
if(firstRun == 0){
changingRedX = 0 - red.getWidth();
yellowXThing = 1;
changingYellowX = canvas.getWidth();
greenXThing = 1;
firstRun = 1;
title = new Paint();
title.setColor(Color.parseColor("#0889ec"));
title.setTextSize(180);
title.setTextAlign(Paint.Align.CENTER);
title.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.BOLD));
play = new Paint();
play.setTextSize(140);
play.setColor(Color.WHITE);
play.setTextAlign(Paint.Align.CENTER);
options = new Paint();
options.setTextSize(140);
options.setColor(Color.WHITE);
options.setTextAlign(Paint.Align.CENTER);
playFixed = getResizedBitmap(playTest, canvas.getWidth()/5, canvas.getHeight()/3);
redFixed = getResizedBitmap(red, canvas.getWidth()/6, (int)canvas.getWidth()/6 * (red.getHeight()/red.getWidth()));
yellowFixed = getResizedBitmap(yellow, canvas.getWidth()/6, (int)canvas.getWidth()/6 * (yellow.getHeight()/yellow.getWidth()));
greenFixed = getResizedBitmap(green, canvas.getWidth()/6, (int)canvas.getWidth()/6 * (green.getHeight()/green.getWidth()));
purpleFixed = getResizedBitmap(purple, canvas.getWidth()/6, (int)canvas.getWidth()/6 * (purple.getHeight()/purple.getWidth()));
}
if((x>(canvas.getWidth()/2)-(playFixed.getWidth()/2)&&(x<(canvas.getWidth()/2)-(playFixed.getWidth()/2) + playFixed.getWidth()))
&& ((y > 4*(canvas.getHeight()/9))&& (y<4*(canvas.getHeight()/9)+playFixed.getHeight()))){
**** HERE IS WHERE I WANT TO START THE NEW INTENT ****
}
if(whereIsRedY == 0){
whereIsRedXY = (int) (Math.random() * canvas.getHeight()) - 20;
whereIsRedY = 1;
}
if(whereIsYellowY == 0){
whereIsYellowXY = (int) (Math.random() * canvas.getHeight()) - 20;
whereIsYellowY = 1;
}
if(whereIsGreenY == 0){
whereIsGreenXY = (int) (Math.random() * canvas.getWidth()) - 20;
whereIsGreenY = 1;
}
if(whereIsPurpleY == 0){
whereIsPurpleXY = (int) (Math.random() * canvas.getWidth()) - 20;
whereIsPurpleY = 1;
}
if((changingRedX > canvas.getWidth() + redFixed.getWidth()) && redXThing == 0){
changingRedX = canvas.getWidth() + 3*(redFixed.getWidth());
whereIsRedY = 0;
redXThing = 1;
}
if((changingRedX < 0 - redFixed.getWidth()) && redXThing == 1){
changingRedX = 0 - 4*(redFixed.getWidth());
whereIsRedY = 0;
redXThing = 0;
}
if(redXThing == 0) {
changingRedX += 10;
}
if(redXThing == 1) {
changingRedX -= 10;
}
if((changingYellowX > canvas.getWidth() + yellowFixed.getWidth()) && yellowXThing == 0){
changingYellowX = canvas.getWidth() + 3*(yellowFixed.getWidth());
whereIsYellowY = 0;
yellowXThing = 1;
}
if((changingYellowX < 0 - yellowFixed.getWidth()) && yellowXThing == 1){
changingYellowX = 0 - 4*(yellowFixed.getWidth());
whereIsYellowY = 0;
yellowXThing = 0;
}
if(yellowXThing == 0) {
changingYellowX += 13;
}
if(yellowXThing == 1) {
changingYellowX -= 13;
}
if((changingGreenX > canvas.getHeight() + greenFixed.getHeight()) && greenXThing == 0){
changingGreenX = canvas.getHeight() + 3*(greenFixed.getHeight());
whereIsGreenY = 0;
greenXThing = 1;
}
if((changingGreenX < 0 - greenFixed.getHeight()) && greenXThing == 1){
changingGreenX = 0 - 4*(greenFixed.getHeight());
whereIsGreenY = 0;
greenXThing = 0;
}
if(greenXThing == 0) {
changingGreenX += 8;
}
if(greenXThing == 1) {
changingGreenX -= 8;
}
if((changingPurpleX > canvas.getHeight() + purpleFixed.getHeight()) && purpleXThing == 0){
changingPurpleX = canvas.getHeight() + 3*(purpleFixed.getHeight());
whereIsPurpleY = 0;
purpleXThing = 1;
}
if((changingPurpleX < 0 - purpleFixed.getHeight()) && purpleXThing == 1){
changingPurpleX = 0 - 4*(purpleFixed.getHeight());
whereIsPurpleY = 0;
purpleXThing = 0;
}
if(purpleXThing == 0) {
changingPurpleX += 15;
}
if(purpleXThing == 1) {
changingPurpleX -= 15;
}
canvas.drawBitmap(redFixed, changingRedX, whereIsRedXY, null);
canvas.drawBitmap(yellowFixed, changingYellowX, whereIsYellowXY, null);
canvas.drawBitmap(purpleFixed, whereIsPurpleXY, changingPurpleX, null);
canvas.drawBitmap(greenFixed, whereIsGreenXY, changingGreenX, null);
canvas.drawText("Mustache Me", (canvas.getWidth() ) / 2, (canvas.getHeight()/3), title);
//canvas.drawText("Play", canvas.getWidth()/2, canvas.getHeight()/2 + 40, play);
canvas.drawBitmap(playFixed, (canvas.getWidth()/2)-(playFixed.getWidth()/2), 4*(canvas.getHeight()/9), null);
canvas.drawText("Options", canvas.getWidth()/2, 2*(canvas.getHeight()/3), options);
ourHolder.unlockCanvasAndPost(canvas);
}
}
}
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth)
{
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
我在我的代码中标记了我想要启动的内容，但我一直收到错误：“无法解析构造函数Intetn（.....）”
我试过的代码是：
Intent i = new Intent(this, WhichGameActivity.class);
感谢您的帮助：）
干杯。
答案 0 :(得分：0)
使用此：
new Intent(GFX.this,WhichGameActivity.class);
你不能只使用this，因为你在内部类中，因此this属于内部类上下文。
答案 1 :(得分：0)
注意Docs对Intent构造函数的说法：
public Intent（Context packageContext，Class cls）
为特定组件创建意图。 ...
参数
packageContext 实现此功能的应用程序包的上下文 类。 cls要用于的组件类 意图。
您的班级MyBringBack不是Context，因此您无法使用此代码：
Intent i = new Intent(this, WhichGameActivity.class);
您必须将MyBringBack的构造函数中收到的上下文存储为字段，例如“myContext”，然后在new Intent()中使用它，如下所示：
Intent i = new Intent(myContext, WhichGameActivity.class);