How to initialize a static SparseArray

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How can I initialize a static, unmodifiable instance of android.util.SparseArray?

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

1

You don't initialize static properties. What exactly are you trying to do?

– Eric
May 5 '13 at 23:01

1

@Eric the SparseArray equivalent of this answer stackoverflow.com/a/507658/884677 for a static map

– firyice
May 5 '13 at 23:08

1

@Eric yes, exactly as I stated in this question, and the linked question/answer

– firyice
May 6 '13 at 0:30

You're better off using a HashMap for this purpose. I tried tackling the same problem.

– IgorGanapolsky
Dec 11 '15 at 16:00

add a comment |

How can I initialize a static, unmodifiable instance of android.util.SparseArray?

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

1

You don't initialize static properties. What exactly are you trying to do?

– Eric
May 5 '13 at 23:01

1

@Eric the SparseArray equivalent of this answer stackoverflow.com/a/507658/884677 for a static map

– firyice
May 5 '13 at 23:08

1

@Eric yes, exactly as I stated in this question, and the linked question/answer

– firyice
May 6 '13 at 0:30

You're better off using a HashMap for this purpose. I tried tackling the same problem.

– IgorGanapolsky
Dec 11 '15 at 16:00

add a comment |

How can I initialize a static, unmodifiable instance of android.util.SparseArray?

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

How can I initialize a static, unmodifiable instance of android.util.SparseArray?

java android collections initialization sparse-array

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

edited May 6 '13 at 1:46

Eric

56.7k18111128

edited May 6 '13 at 1:46

Eric

56.7k18111128

edited May 6 '13 at 1:46

Eric

56.7k18111128

asked May 5 '13 at 23:00

firyice

192422

asked May 5 '13 at 23:00

firyice

192422

asked May 5 '13 at 23:00

firyice

192422

1

You don't initialize static properties. What exactly are you trying to do?

– Eric
May 5 '13 at 23:01

1

@Eric the SparseArray equivalent of this answer stackoverflow.com/a/507658/884677 for a static map

– firyice
May 5 '13 at 23:08

1

@Eric yes, exactly as I stated in this question, and the linked question/answer

– firyice
May 6 '13 at 0:30

You're better off using a HashMap for this purpose. I tried tackling the same problem.

– IgorGanapolsky
Dec 11 '15 at 16:00

add a comment |

1

You don't initialize static properties. What exactly are you trying to do?

– Eric
May 5 '13 at 23:01

1

@Eric the SparseArray equivalent of this answer stackoverflow.com/a/507658/884677 for a static map

– firyice
May 5 '13 at 23:08

1

@Eric yes, exactly as I stated in this question, and the linked question/answer

– firyice
May 6 '13 at 0:30

You're better off using a HashMap for this purpose. I tried tackling the same problem.

– IgorGanapolsky
Dec 11 '15 at 16:00

You don't initialize static properties. What exactly are you trying to do?

– Eric
May 5 '13 at 23:01

@Eric the SparseArray equivalent of this answer stackoverflow.com/a/507658/884677 for a static map

– firyice
May 5 '13 at 23:08

@Eric yes, exactly as I stated in this question, and the linked question/answer

– firyice
May 6 '13 at 0:30

You're better off using a HashMap for this purpose. I tried tackling the same problem.

– IgorGanapolsky
Dec 11 '15 at 16:00

add a comment |

4 Answers
4

active

oldest

votes

You cannot do what you are attempting to. At least, not how you are attempting to do it. There is no implementation of SparseArray that is unmodifiable.

However, you could create one. Here's how:

Create a class, say CustomSparseArray<E>, and have it extend SparseArray.

Override all methods that change the elements in the array, and replace them with something like this:

@Override

public void append(int key, E value) {

    if (mLocked)

        return; // Maybe throw an exception

    super.append(key, value);

}

Then, add in a member variable to the class, boolean mLocked = false;.

Next, you need a method like the following:
```
public void lock() { mLocked = true; }
```

Lastly, implement your static variable using a method similar to in the other post:

public class Test {

    private static final CustomSparseArray<Integer> myArray;

    static {

        myArray = new CustomSparseArray<Integer>();

        myArray.append(1, 1);

        myArray.append(2, 5);

        myArray.lock();

    }

}

Then you have an unmodifiable SparseArray in your static variable myArray.

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

add a comment |

Here is a better way using an anonymous class:

static final SparseIntArray myArray = new SparseIntArray() {

    {

        append(1, 2);

        append(10, 20);

    }

};

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

add a comment |

This works for me:

static final SparseIntArray CMyArray = new SparseIntArray();

static {

    CMyArray.append(2, 4);

    CMyArray.append(8, 3);

    CMyArray.append(255, 1);

}

as per: https://docs.oracle.com/javase/tutorial/java/javaOO/initial.html

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

add a comment |

For unmodifiable instance of android.util.SparseArray you can use Google implementation:

https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/hdmi/UnmodifiableSparseArray.java

answered Jan 3 at 9:28

intra

34036

add a comment |

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4 Answers
4

active

oldest

votes

4 Answers
4

active

oldest

votes

You cannot do what you are attempting to. At least, not how you are attempting to do it. There is no implementation of SparseArray that is unmodifiable.

However, you could create one. Here's how:

Create a class, say CustomSparseArray<E>, and have it extend SparseArray.

Override all methods that change the elements in the array, and replace them with something like this:

@Override

public void append(int key, E value) {

    if (mLocked)

        return; // Maybe throw an exception

    super.append(key, value);

}

Then, add in a member variable to the class, boolean mLocked = false;.

Next, you need a method like the following:
```
public void lock() { mLocked = true; }
```

Lastly, implement your static variable using a method similar to in the other post:

public class Test {

    private static final CustomSparseArray<Integer> myArray;

    static {

        myArray = new CustomSparseArray<Integer>();

        myArray.append(1, 1);

        myArray.append(2, 5);

        myArray.lock();

    }

}

Then you have an unmodifiable SparseArray in your static variable myArray.

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

add a comment |

You cannot do what you are attempting to. At least, not how you are attempting to do it. There is no implementation of SparseArray that is unmodifiable.

However, you could create one. Here's how:

Create a class, say CustomSparseArray<E>, and have it extend SparseArray.

Override all methods that change the elements in the array, and replace them with something like this:

@Override

public void append(int key, E value) {

    if (mLocked)

        return; // Maybe throw an exception

    super.append(key, value);

}

Then, add in a member variable to the class, boolean mLocked = false;.

Next, you need a method like the following:
```
public void lock() { mLocked = true; }
```

Lastly, implement your static variable using a method similar to in the other post:

public class Test {

    private static final CustomSparseArray<Integer> myArray;

    static {

        myArray = new CustomSparseArray<Integer>();

        myArray.append(1, 1);

        myArray.append(2, 5);

        myArray.lock();

    }

}

Then you have an unmodifiable SparseArray in your static variable myArray.

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

add a comment |

You cannot do what you are attempting to. At least, not how you are attempting to do it. There is no implementation of SparseArray that is unmodifiable.

However, you could create one. Here's how:

Create a class, say CustomSparseArray<E>, and have it extend SparseArray.

Override all methods that change the elements in the array, and replace them with something like this:

@Override

public void append(int key, E value) {

    if (mLocked)

        return; // Maybe throw an exception

    super.append(key, value);

}

Then, add in a member variable to the class, boolean mLocked = false;.

Next, you need a method like the following:
```
public void lock() { mLocked = true; }
```

Lastly, implement your static variable using a method similar to in the other post:

public class Test {

    private static final CustomSparseArray<Integer> myArray;

    static {

        myArray = new CustomSparseArray<Integer>();

        myArray.append(1, 1);

        myArray.append(2, 5);

        myArray.lock();

    }

}

Then you have an unmodifiable SparseArray in your static variable myArray.

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

You cannot do what you are attempting to. At least, not how you are attempting to do it. There is no implementation of SparseArray that is unmodifiable.

However, you could create one. Here's how:

Create a class, say CustomSparseArray<E>, and have it extend SparseArray.

Override all methods that change the elements in the array, and replace them with something like this:

@Override

public void append(int key, E value) {

    if (mLocked)

        return; // Maybe throw an exception

    super.append(key, value);

}

Then, add in a member variable to the class, boolean mLocked = false;.

Next, you need a method like the following:
```
public void lock() { mLocked = true; }
```

Lastly, implement your static variable using a method similar to in the other post:

public class Test {

    private static final CustomSparseArray<Integer> myArray;

    static {

        myArray = new CustomSparseArray<Integer>();

        myArray.append(1, 1);

        myArray.append(2, 5);

        myArray.lock();

    }

}

Then you have an unmodifiable SparseArray in your static variable myArray.

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

edited May 23 '17 at 11:47

Community♦

edited May 23 '17 at 11:47

Community♦

edited May 23 '17 at 11:47

Community♦

answered May 6 '13 at 1:43

Eric

56.7k18111128

answered May 6 '13 at 1:43

Eric

56.7k18111128

answered May 6 '13 at 1:43

Eric

56.7k18111128

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

add a comment |

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

This is exactly what I was looking for. Thank you!

– firyice
May 6 '13 at 20:29

add a comment |

Here is a better way using an anonymous class:

static final SparseIntArray myArray = new SparseIntArray() {

    {

        append(1, 2);

        append(10, 20);

    }

};

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

add a comment |

Here is a better way using an anonymous class:

static final SparseIntArray myArray = new SparseIntArray() {

    {

        append(1, 2);

        append(10, 20);

    }

};

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

add a comment |

Here is a better way using an anonymous class:

static final SparseIntArray myArray = new SparseIntArray() {

    {

        append(1, 2);

        append(10, 20);

    }

};

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

Here is a better way using an anonymous class:

static final SparseIntArray myArray = new SparseIntArray() {

    {

        append(1, 2);

        append(10, 20);

    }

};

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

edited Dec 26 '17 at 9:16

Hi I'm Frogatto

20.5k86097

answered Dec 19 '13 at 2:43

Peter

4,38294393

answered Dec 19 '13 at 2:43

Peter

4,38294393

answered Dec 19 '13 at 2:43

Peter

4,38294393

add a comment |

This works for me:

static final SparseIntArray CMyArray = new SparseIntArray();

static {

    CMyArray.append(2, 4);

    CMyArray.append(8, 3);

    CMyArray.append(255, 1);

}

as per: https://docs.oracle.com/javase/tutorial/java/javaOO/initial.html

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

add a comment |

This works for me:

static final SparseIntArray CMyArray = new SparseIntArray();

static {

    CMyArray.append(2, 4);

    CMyArray.append(8, 3);

    CMyArray.append(255, 1);

}

as per: https://docs.oracle.com/javase/tutorial/java/javaOO/initial.html

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

add a comment |

This works for me:

static final SparseIntArray CMyArray = new SparseIntArray();

static {

    CMyArray.append(2, 4);

    CMyArray.append(8, 3);

    CMyArray.append(255, 1);

}

as per: https://docs.oracle.com/javase/tutorial/java/javaOO/initial.html

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

This works for me:

static final SparseIntArray CMyArray = new SparseIntArray();

static {

    CMyArray.append(2, 4);

    CMyArray.append(8, 3);

    CMyArray.append(255, 1);

}

as per: https://docs.oracle.com/javase/tutorial/java/javaOO/initial.html

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

answered Mar 6 '17 at 9:23

PJ_Finnegan

6931811

add a comment |

For unmodifiable instance of android.util.SparseArray you can use Google implementation:

https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/hdmi/UnmodifiableSparseArray.java

answered Jan 3 at 9:28

intra

34036

add a comment |

For unmodifiable instance of android.util.SparseArray you can use Google implementation:

https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/hdmi/UnmodifiableSparseArray.java

answered Jan 3 at 9:28

intra

34036

add a comment |

For unmodifiable instance of android.util.SparseArray you can use Google implementation:

https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/hdmi/UnmodifiableSparseArray.java

answered Jan 3 at 9:28

intra

34036

For unmodifiable instance of android.util.SparseArray you can use Google implementation:

https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/hdmi/UnmodifiableSparseArray.java

answered Jan 3 at 9:28

intra

34036

answered Jan 3 at 9:28

intra

34036

answered Jan 3 at 9:28

intra

34036

answered Jan 3 at 9:28

intra

34036

add a comment |

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