TextView [] []數組正在崩潰的應用程序，爲什麼？

Question

我想使用一個TextView數組的數組。當我嘗試在每個TextView數組（每個TextView的代碼中嵌套'for'循環）中設置文本時，應用程序崩潰。這裏是我的代碼：

package com.example.whynotworking; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

TextView[] FirstArray; 
TextView[] SecondArray; 
TextView[] ThirdArray; 

int SizeOfTextViewArrays; 

TextView[][] TheArrayArray = {FirstArray,SecondArray,ThirdArray}; 

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

    Log.d("DebugTAG", "no problems yet"); 

    SizeOfTextViewArrays = 5; 

    FirstArray = new TextView[SizeOfTextViewArrays]; 
    SecondArray = new TextView[SizeOfTextViewArrays]; 
    ThirdArray = new TextView[SizeOfTextViewArrays]; 

    Log.d("DebugTAG", "still no problems"); 

    taskIwantToDo(); 
} 

public void taskIwantToDo() { 
    for (int i = 0; i < TheArrayArray.length; i++) { 
    for (int j = 0; j < SizeOfTextViewArrays; j++) { 
     Log.d("DebugTAG", "I see this log come up once"); 
     TheArrayArray[i][j].setText("Text to set..."); 
     Log.d("DebugTAG", "But I don't see this one..."); 
    } 
    } 
} 
} 

我認爲這個問題的一部分是被宣佈和onCreate（）方法之外發起的TextView [] []數組。但是，當我嘗試啓動它裏面的onCreate（），它（Eclipse IDE中）告訴我：「數組常量只能在初始化使用」 ...

的logcat的輸出是：

07-05 21： 08：20.346：D/DebugTAG（340）：沒有問題 07-05 21：08：20.346：D/DebugTAG（340）：仍然沒有問題 07-05 21：08：20.346：D/DebugTAG（340） ：我看到這篇日誌上來一次

感謝

Answer 1

您需要創建數組的內容：

public void taskIwantToDo() { 
    for (int i = 0; i < TheArrayArray.length; i++) { 
     for (int j = 0; j < SizeOfTextViewArrays; j++) { 
      TheArrayArray[i][j] = new TextView(this); // <-- THIS LINE 
      TheArrayArray[i][j].setText("Text to set..."); 
     } 
    } 
} 

之前，但是你需要正確地創建你的陣列。無論是做這一切在模塊級：

int SizeOfTextViewArrays = 5; 

TextView[] FirstArray = new TextView[SizeOfTextViewArrays]; 
TextView[] SecondArray = new TextView[SizeOfTextViewArrays]; 
TextView[] ThirdArray = new TextView[SizeOfTextViewArrays]; 

TextView[][] TheArrayArray = {FirstArray,SecondArray,ThirdArray}; 

或做這一切在onCreate：

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

    Log.d("DebugTAG", "no problems yet"); 

    SizeOfTextViewArrays = 5; 

    FirstArray = new TextView[SizeOfTextViewArrays]; 
    SecondArray = new TextView[SizeOfTextViewArrays]; 
    ThirdArray = new TextView[SizeOfTextViewArrays]; 

    TheArrayArray = {FirstArray,SecondArray,ThirdArray};