我有几项活动。在mainActivity我有4个按钮，每个按钮都会导致另一个活动。
在三个活动中，我激活了一个绘制画布的线程，在每个活动中我都有一个按钮返回mainActivity。我尝试过使用：
Intent i = new Intent(getApplicationContext(), MainActivity.class);
// i tried also (theClassName.this,MainActivity.Class)
startActivity(i);
当我点击返回按钮时，我确实返回mainActivity但应用程序停止响应（它提醒我应用程序没有响应，我必须在等待或退出应用程序之间做出选择等待没有帮助。
当我使用
时finish();
代替，
然后点击返回按钮，我返回设备的主屏幕（退出应用程序）但没有退出 - 我仍然可以使用任务管理器返回应用程序，当我做了它让我回到我输入的活动而不是mainActivity。
正如我所说，mainActivity上有4个按钮，当我使用第四个按钮时，它转到另一个没有激活线程的活动，它只有listView，当我从它返回时到mainActivity它确实有效。
我该如何解决？谢谢你的帮助
*出现问题时，没有错误堆栈跟踪。
*如果您需要查看任何代码，我很乐意在此处发布
代码：
MainActivity：
public class MainActivity extends Activity {
Button classic;
Button vsPlayer;
Button vsComp;
// Button settings;
Button scores;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
classic=(Button) findViewById(R.id.Classic);
classic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,ClassicActivity.class);
startActivity(i);
}
});
vsPlayer=(Button) findViewById(R.id.PlayerVSPlayer);
vsPlayer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,VsPlayerActivity.class);
startActivity(i);
}
});
vsComp=(Button) findViewById(R.id.PlayerVSComp);
vsComp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,VsCompActivity.class);
startActivity(i);
}
});
/* settings=(Button) findViewById(R.id.Settings);
settings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,SettingsActivity.class);
startActivity(i);
}
});
*/
scores=(Button) findViewById(R.id.Scores);
scores.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(MainActivity.this,ScoresActivity.class);
startActivity(i);
}
});
}//onCreate
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.mains, menu);
return true;
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
MainActivity.this.finish();
}
}
- = ------其他一些活动：
public class ClassicActivity extends Activity {
Classic g;
ImageView left;
ImageView right;
ImageView up;
ImageView down;
TextView pause;
TextView back;
TextView scoretv;
LinearLayout surface;
LinearLayout screen;
LinearLayout stoped;
LinearLayout gameover;
ScoreDataSource sds;
Button no;
Button yes;
EditText name;
Button continueb;
Button leave;
//protected static TextView MyScore;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*requestWindowFeature(Window.FEATURE_NO_TITLE);
v= new GameView1(this);
setContentView(v);
*/
setContentView(R.layout.activity_classic);
sds=new ScoreDataSource(this);
gameover=(LinearLayout) findViewById(R.id.gameover);
screen = (LinearLayout)findViewById(R.id.screen);
surface = (LinearLayout)findViewById(R.id.surface);
g= new Classic(this, surface);
surface.addView(g);
//MyScore=(TextView) findViewById(R.id.MyScore);
//MyScore.setText("My score:"+gv.getPoints());
left=(ImageView) findViewById(R.id.left);
right=(ImageView) findViewById(R.id.right);
up=(ImageView) findViewById(R.id.up);
down=(ImageView) findViewById(R.id.down);
left.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(g.snake.getDir()!="LEFT"&&g.snake.getDir()!="RIGHT"){
g.snake.Left();
}
}
});
right.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(g.snake.getDir()!="RIGHT"&&g.snake.getDir()!="LEFT"){
g.snake.Right();
}
}
});
up.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(g.snake.getDir()!="UP"&&g.snake.getDir()!="DOWN"){
g.snake.Up();
}
}
});
down.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(g.snake.getDir()!="DOWN"&&g.snake.getDir()!="UP"){
g.snake.Down();
}
}
});
pause=(TextView) findViewById(R.id.Pause);
back=(TextView) findViewById(R.id.Back);
stoped=(LinearLayout) findViewById(R.id.stoped);
pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(g.getRunning()){
pause.setText("continue");
g.setRunning(false);
}
else{
pause.setText("pause");
g.setRunning(true);
new Thread(g.snakethread).start();
}
}
});
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
g.setRunning(false);
stoped.setVisibility(View.VISIBLE);
}
});
no=(Button) findViewById(R.id.no);
yes=(Button) findViewById(R.id.yes);
continueb=(Button) findViewById(R.id.Continue);
leave=(Button) findViewById(R.id.leave);
no.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
name=(EditText) findViewById(R.id.name);
yes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy");
String date = df.format(c.getTime());
sds.open();
Score s=new Score(0,name.getText().toString(),date, g.getPoints(),"Classic");
s=sds.createScore(s);
sds.close();
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}
});
continueb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stoped.setVisibility(View.GONE);
g.setRunning(true);
new Thread(g.snakethread).start();
}
});
leave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}
});
scoretv=(TextView) findViewById(R.id.scoretv);
screen.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(g.getGameover()){
scoretv.setText("Your score is:"+g.getPoints());
gameover.setVisibility(View.VISIBLE);
g.setGameover(false);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
---- ClassicActivity使用此活动：
public class Classic extends SurfaceView implements Runnable {
private boolean isRunning=false;
private final long FPS=8;//MAX is 16
final float scale = Resources.getSystem().getDisplayMetrics().density;
float PART_SIZE= 10*scale;
private SurfaceHolder holder;
Thread snakethread;
static SnakePlayer snake;
Arena a;
LinearLayout view;
Bitmap arena;
Food food1;
Boolean gameover;
int points;
Paint writePB=new Paint();
Paint writePR=new Paint();
public Classic(Context context,LinearLayout view) {
super(context);
this.gameover=false;
this.view=view;
this.a=new Arena(view,PART_SIZE,33,36,1,0);
this.food1=new Food(PART_SIZE,"GRAY");
points=0;
writePB.setColor(Color.BLACK);
writePB.setTextSize(PART_SIZE);
writePR.setColor(Color.RED);
writePR.setTextSize(PART_SIZE);
snakethread=new Thread(this);
holder= getHolder();
holder.addCallback(new SurfaceHolder.Callback(){
@Override
public void surfaceCreated(SurfaceHolder arg0) {
setRunning(true);
snakethread.start();
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,int arg3) {
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
setRunning(false);
while(true){
try {
snakethread.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
snake=new SnakePlayer(0+3*PART_SIZE, 0+3*PART_SIZE, "RIGHT",PART_SIZE,2,"RED","BLACK");
}
@SuppressLint("WrongCall")
@Override
public void onDraw(Canvas c) {
a.onDraw(c);
c.drawText("Your Score:"+points, 5*scale, 10*scale, writePB);
food1.drawFood(c);
snake.onDraw(c);
}
@SuppressLint("WrongCall")
@Override
public void run() {
long stepPerSecond=1000/FPS;
long startTime;
long sleepTime;
Canvas c = null;
while(isRunning){
startTime=System.currentTimeMillis();
c = null;
try{
c=this.getHolder().lockCanvas();
onDraw(c);
}
catch(Exception e){
}
finally{
if(c!=null){
this.getHolder().unlockCanvasAndPost(c);
}
}
AllChecks(c);
sleepTime= stepPerSecond-(System.currentTimeMillis()-startTime);
if(sleepTime>0)
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(gameover){
try{
c=this.getHolder().lockCanvas();
c.drawText("GAMEOVER", 125*scale, 150*scale, writePR);
c.drawText("Touch Anywhere To Continue ", 87*scale, 162*scale, writePR);
}
catch(Exception e){
}
finally{
if(c!=null){
this.getHolder().unlockCanvasAndPost(c);
}
}
}
}
boolean firstTime=true;
public void AllChecks(Canvas c){
/*
* Call all the right function, to check if the snake has bumped in a wall, or eaten a food.
*/
if(Arena.WallCollision(snake.getxLoc(), snake.getyLoc())){
setRunning(false);
gameover=true;
}
if(snake.snakeCollisionNoHead(snake.getxLoc(), snake.getyLoc())){
setRunning(false);
gameover=true;
}
if(firstTime){
firstTime=false;
changeFoodLoc(food1);
}
if(food1.hasEaten(snake.getxLoc(), snake.getyLoc())){
changeFoodLoc(food1);
snake.Add();
points+=10;
}
}
public void changeFoodLoc(Food food){
/*
* if a snake has eaten a food it changes the location of the food randomly
*/
Random rnd = new Random();
food.x=(rnd.nextInt(32) + 3)*food.SIZE;
food.y=(rnd.nextInt(35) + 1)*food.SIZE;
if(snake.snakeCollision(food.getX(), food.getY()))
changeFoodLoc(food);
}
public void setRunning(boolean b){
isRunning=b;
}
public Boolean getRunning(){
return isRunning;
}
public int getPoints() {
return points;
}
public void setPoints(int points) {
this.points = points;
}
public Boolean getGameover() {
return gameover;
}
public void setGameover(Boolean gameover) {
this.gameover = gameover;
}
}
答案 0 :(得分：1)
首先，我会尝试删除onPause的MainActivity上的覆盖 - 您不需要调用finish。在第二个活动中，如果您想回到第二个活动的MainActivity-呼叫结束，它应该返回到MainActivity。