在第一次運行打開教程不能正常工作

Question

我有我的應用程序的教程顯示了當用戶運行它首次

 Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     public void run() { 
      if (firstRun == true) { 


       Intent tut = new Intent(MainActivity.this, Tutorial.class); 
       startActivity(tut); 
       firstRun = false; 

      } 
     } 
    }, 200); 

我已經推遲，因爲沒有延遲，我只是得到一個黑屏（界面沒有時間加載）

但是這樣做讓我多次打開Tutorial.class，我做錯了什麼？

編輯：

下面是一些更多的代碼，我不會糊所有的它，因爲它是唯一太長閱讀和它不會與問題相關的

我救我偏好這樣的

@Override 
protected void onStop(){ 
    super.onStop(); 

    // We need an Editor object to make preference changes. 
    // All objects are from android.context.Context 
    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
    SharedPreferences.Editor editor = settings.edit(); 
    editor.putInt("Counter1", counter); 
    editor.putInt("Counter2", counter2); 
    editor.putBoolean("FirstRun", firstRun); 
    editor.putString("Label1", label1S); 
    editor.putString("Label2", label2S); 

    editor.commit(); 
} 
protected void onPause(){ 
    super.onPause(); 

    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
    SharedPreferences.Editor editor = settings.edit(); 
    editor.putInt("Counter1", counter); 
    editor.putInt("Counter2", counter2); 

    editor.commit(); 
} 

這是我如何在onCreate（）內恢復它們;

// Restore previous settings and data 


    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); 
    int counterRestored = settings.getInt("Counter1", 0); 
    int counter2Restored = settings.getInt("Counter2", 0); 
    boolean firstRunRestored = settings.getBoolean("FirstRun", true); 
    String label1Restored = settings.getString("Label1", "Counter 1"); 
    String label2Restored = settings.getString("Label2", "Counter 2"); 
    counter = counterRestored; 
    counter2 = counter2Restored; 
    firstRun = firstRunRestored; 
    label1S = label1Restored; 
    label2S = label2Restored; 
    renameLabel(); 
    calculateTotal(); 

這是我的第二個活動Tutorial.class

public class Tutorial extends MainActivity{ 

ImageButton btnSkip, btnSkip2, btnNext, btnNext2; 
RelativeLayout tutorial, tutPage1, tutPage2; 


public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.tutorial); 


    btnSkip = (ImageButton) findViewById(R.id.btn_skip); 
    btnNext = (ImageButton) findViewById(R.id.btn_next); 
    btnSkip2 = (ImageButton) findViewById(R.id.btn_skip2); 
    btnNext2 = (ImageButton) findViewById(R.id.btn_next2); 
    tutorial = (RelativeLayout) findViewById(R.id.tutorial); 
    tutPage1 = (RelativeLayout) findViewById(R.id.page1); 
    tutPage2 = (RelativeLayout) findViewById(R.id.page2); 


    btnSkip.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v) { 
      finish(); 
     } 
    }); 
    btnSkip2.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v) { 
      finish(); 
     } 
    }); 
    btnNext.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v) { 
      tutPage1.setVisibility(View.GONE); 
      tutPage2.setVisibility(View.VISIBLE); 
     } 
    }); 
    btnNext2.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v) { 
      tutPage1.setVisibility(View.VISIBLE); 
      tutPage2.setVisibility(View.GONE); 
      tutorial.setVisibility(View.VISIBLE); 
      finish(); 
     } 
    }); 

} 

}

Answer 1

你爲什麼不嘗試

if(firstRun){ 
    firstRun = false; 
    Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     public void run() { 
      Intent tut = new Intent(MainActivity.this, Tutorial.class); 
      startActivity(tut); 
     } 
    } 
    }, 200); 
} 

Answer 2

的firstRun的值不會超過persistantly存儲幾次運行。

您應該將此值存儲在SharedPreferences中，以便在應用程序關閉後它將保留其值。你可以找到關於如何使用SharedPreferences here的教程。