Question

这是我的代码。非常简单..但是当我点击后退按钮时，会出现第二个活动..

 public class MainActivity extends ActionBarActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Thread t = new Thread(){
        public void run(){
            try{
                sleep(3000);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
                Intent i = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(i);
            }
        }
    };
    t.start();
 }

 @Override
 protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    this.finish();
  }

}

我还放入了清单文件，但我仍然遇到同样的问题..

        android:noHistory="true"

Answer 1

} finally {
   Intent intent = new Intent();
   intent.setClass(SplashActivity.this, MainActivity.class);
   intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
   startActivityForResult(intent, 0);
   finish();
}

Answer 2

我建议您切换到在doInBackground（）期间休眠3秒的AsyncTask并启动新活动+在onPostExecute（）中杀死当前的活动，但仅当isCancelled（）不为真时。

然后覆盖你的splash活动的onBackPressed（）并且：

取消当前的异步任务（在本地变量中保存对它的引用）。
完成当前活动。

这样AsyncTask仍然会在后台睡3秒，但是当它的onPostExecute（）出现时，它会通过检查isCancelled（）而不是启动第二个活动来知道它被取消了。

请参阅：AsyncTask documentation

Answer 3

使用Handler这样制作Splash屏幕

private static final int SPLASH_TIME_OUT = 3000;
    private Handler mHandler = new Handler();
    private Runnable mRunnable;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        mRunnable = new Runnable() {

            @Override
            public void run() {
                openLandingActivity();
            }
        };
        mHandler.postDelayed(mRunnable, SPLASH_TIME_OUT);//
    }

    protected void openLandingActivity() {
        // TODO Auto-generated method stub
        Intent intent = new Intent(MainActivity.this,SecondActivity.class);
        startActivity(intent);
        finish();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        if(keyCode == KeyEvent.KEYCODE_BACK) {
            mHandler.removeCallbacks(mRunnable);
            finish();
        }
        return super.onKeyDown(keyCode, event);
    }

Answer 4

试试这个希望它会帮助你..

private final int SPLASH_DISPLAY_LENGHT = 5000;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) 
{
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);
    /* New Handler to start the Menu-Activity 
     * and close this Splash-Screen after some seconds.*/
    new Handler().postDelayed(new Runnable(){
        @Override
        public void run() {
            /* Create an Intent that will start the Menu-Activity. */
             Intent i = new Intent(MainActivity.this,SecondActivity.class);
            startActivity(i);
            splash.this.finish();
        }
    }, SPLASH_DISPLAY_LENGHT);
}

}

Answer 5

我不得不使用onKeyDown（）方法使问题消失。这是固定代码..

  public class MainActivity extends ActionBarActivity {
  private boolean isBackPressed = false;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Thread t = new Thread(){
        public void run(){
            try{
                sleep(3000);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
                if(!isBackPressed){
                Intent i = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(i);

                }
            }
        }
    };
    t.start();
 }


@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        isBackPressed = true;
        finish();
    }
    return super.onKeyDown(keyCode, event);

}

}

单击后退按钮时，不会杀死启动画面活动

5 个答案: