Java 安卓：意图-停止活动
我在Android Studio中编写了一个简单的游戏。游戏结束后，我想切换到另一项活动，但意图不起作用。每次应用程序发送错误时，都会意外停止。按下图片时，我在onTouch方法中调用Intent。我尝试了各种与上下文或getApplicationContext的组合，等等。我在不同的平台上冲浪，但我无法解决这个问题 谢谢你的帮助 活动游戏场景Java 安卓：意图-停止活动,java,android,android-intent,Java,Android,Android Intent,我在Android Studio中编写了一个简单的游戏。游戏结束后，我想切换到另一项活动，但意图不起作用。每次应用程序发送错误时，都会意外停止。按下图片时，我在onTouch方法中调用Intent。我尝试了各种与上下文或getApplicationContext的组合，等等。我在不同的平台上冲浪，但我无法解决这个问题 谢谢你的帮助 活动游戏场景 public class GamePlayScene extends Activity implements Scene { @Override pr
public class GamePlayScene extends Activity implements Scene {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public GamePlayScene()
{
player = new RectPlayer(new Rect(100, 100, 200, 200), Color.rgb(255, 0, 0));
playerPoint = new Point(Constants.SCREEN_WITH / 2, 7 * Constants.SCREEN_HEIGHT / 8); //Constants.SCREEN_WITH/2, 7*Constants.SCREEN_HEIGHT/8
player.update(playerPoint);
obstacleManager = new ObstacleManager(100, Constants.SCREEN_HEIGHT / 3, 100, Color.YELLOW);
coinManager = new CoinManager(79, Constants.SCREEN_HEIGHT, 76, Color.YELLOW);
gameState = 0;
orientationData = new OrientationData();
orientationData.register();
frameTime = System.currentTimeMillis();
up = false;
wait = true;
BitmapFactory bf = new BitmapFactory();
restartButtonBitmap = bf.decodeResource(Constants.CURRENT_CONTEXT.getResources(), R.drawable.restartbutton);
donateButtonBitmap = bf.decodeResource(Constants.CURRENT_CONTEXT.getResources(), R.drawable.donate);
}
public void reset() {
playerPoint = new Point(Constants.SCREEN_WITH / 2, 7 * Constants.SCREEN_HEIGHT / 8);
player.update(playerPoint);
obstacleManager = new ObstacleManager(100, 2 * Constants.SCREEN_HEIGHT / 10, 100, Color.BLUE);
coinManager = new CoinManager(79, Constants.SCREEN_HEIGHT, 76, Color.YELLOW);
movingPlayer = false;
konto = konto + muenzen;
reset = true;
speed = false;
gameState = 0;
muenzen = 0;
count = 0;
}
@Override
public void receiveTouch(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
float posX = event.getX();
float posY = event.getY();
float x1 = (Constants.SCREEN_WITH / 2) - (restartButtonBitmap.getWidth() / 2),
x2 = Constants.SCREEN_WITH / 2 + (restartButtonBitmap.getWidth() / 2),
y1 = Constants.SCREEN_HEIGHT / 2 - (restartButtonBitmap.getHeight() / 2),
y2 = Constants.SCREEN_HEIGHT / 2 + (restartButtonBitmap.getHeight() / 2);
float x3 = (Constants.SCREEN_WITH / 2) - (donateButtonBitmap.getWidth() / 2),
x4 = Constants.SCREEN_WITH / 2 + (donateButtonBitmap.getWidth() / 2),
y3 = Constants.SCREEN_HEIGHT / 2 + restartButtonBitmap.getHeight() / 2 + 50 + donateButtonBitmap.getHeight() / 2,
y4 = Constants.SCREEN_HEIGHT / 2 + restartButtonBitmap.getHeight() / 2 + 50 + donateButtonBitmap.getHeight() / 2 +
donateButtonBitmap.getHeight();
if (gameState == 0) {
gameState++;
}
if (gameOver && (posX >= x1 && posX <= x2) && (posY >= y1 && posY <= y2)) {
// we are in the square
gameState = 2;
//http://androidforums.com/threads/touch-event-on-image-made-on-canvas.210019/
}
if (!gameOver && gameState == 1) {
movingPlayer = true;
count++;
start=true;
if(count==1)
{
jump();
}
}
if (gameOver && (posX >= x3 && posX <= x4) && (posY >= y3 && posY <= y4)) {
Intent intent = new Intent(GamePlayScene.this, UserLogin.class);
startActivity(intent);
}
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
movingPlayer = false;
up = false;
break;
}
}
@Override
public void draw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
player.draw(canvas);
obstacleManager.draw(canvas);
coinManager.draw(canvas);
if (gameOver) {
canvas.drawBitmap(restartButtonBitmap, Constants.SCREEN_WITH / 2 - restartButtonBitmap.getWidth() / 2,
Constants.SCREEN_HEIGHT / 2 - restartButtonBitmap.getHeight() / 2, new Paint());
canvas.drawBitmap(donateButtonBitmap, Constants.SCREEN_WITH / 2 - donateButtonBitmap.getWidth() / 2,
Constants.SCREEN_HEIGHT / 2 + restartButtonBitmap.getHeight() / 2 + 50 + donateButtonBitmap.getHeight() / 2, new Paint());
}
}
@Override
public void update() {
if (playerPoint.y > Constants.SCREEN_HEIGHT)
{
gameOver = true;
}
if (gameState == 2) {
reset();
gameState = 0;
orientationData.newGame();
gameOver = false;
}
}
}
`在android中，您通常使用onCreate方法而不是构造函数进行操作。
尝试调用GamePlaySecene，假设这是您在onCreate中要做的第一件事，或者将其代码放在onCreate方法中。您的TouchEvent可能返回null，因为没有任何内容被初始化，因为它不在onCreate中。我发现了错误。GamePlaySecene不是aktive场景，我没有将上下文转移到GamePlaySecene，因此缺少上下文。您忘记在super.onCreatesavedInstanceState之后调用GamePlaySecene；我将代码放入onCreate方法中，但随后只有一个黑屏，它会立即停止。您可以尝试按希望执行的顺序在onCreate中调用函数。PS：请更改GameplaySecene函数的名称，因为它会与构造函数混淆。谢谢您的帮助！但是gameplaysecene函数是构造函数，如果没有构造函数，应用程序将停止。同样，当我将构造函数中的代码放入onCreate并删除构造函数时。
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/unnamed"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".Info" />
<activity android:name=".Einstellungen" />
<activity android:name=".Spenden" />
<activity android:name=".Spenden2" />
<activity android:name=".MainGame" />
<activity android:name=".LoginActivity" />
<activity android:name=".RegisterActivity" />
<activity android:name=".UserLogin" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".GamePlayScene"></activity>
</application>