Android: Shared preferences not saving the state of the buttons

问题

I have a tab-host with three activities and in each activity I have buttons.

On each button press I am changing the background drawable resource

So now How can I save the pressed state of each button in all three child activities so that when I move from one activity to the other, the button pressed state will be reflected on moving back. first activity -> all 2 buttons pressed -> go to 2nd activity -> come back to first activity -> all buttons in first activity should be in pressed state with the drawable resource changed

I have two background Images.

button press -> highlited background image -> second time press same button ->changes to normal background Image

For the first time when I run the application and If I press the button the background image is getting changed. If I go to 2nd child activity and coming back so the button is in pressed state with changed drawable resource. so Its fine

for the second time If I press the same button and coming back to the same activity from second activity. here its not working

First child activity -> press button ->high lighted background image changes ->go to second tabhost child activity -> come back to first child activity -> button is showing the same background image after pressing(this is fine)

the problem is

now you press the same button in first child activity -> background image changes to normal ->go to second tabhost child activity -> come back to first child activity -> but the button background resource is in highlighted instead of normal

and even If I run the application once again the button is showing the highligted background image

the below code I am using in my first child activity

EDITED

public void onResume() {
    super.onResume();
    SharedPreferences sharedPreferences = this.getSharedPreferences(
            "sharedPreferences", MODE_PRIVATE);

    int which = sharedPreferences.getInt("sharedPreferences", 1);
    switch (which)
    { 
        case 1:
            seatdirnbtn.setBackgroundResource(R.drawable.icon4); break; 
        case 2:
            seatdirnbtn.setBackgroundResource(R.drawable.icon4hlt); break;
        default:
            seatdirnbtn.setBackgroundResource(R.drawable.icon4); break;
    }
}

public void onPause() {
    super.onPause();
     boolean isclick = false;
    SharedPreferences sharedPreferences = this.getSharedPreferences(
            "sharedPreferences", MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();

    if (isclick) {  
        seatdirnbtn.setBackgroundResource(R.drawable.icon4hlt);   

        editor.putInt("sharedPreferences", 2).commit();
    }
}

EDIT2

     public static boolean isclick = false;
private View.OnClickListener listner1 = new View.OnClickListener() {

    public void onClick(View v) {

    if (isclick) {
            seatdirnbtn.setBackgroundResource(R.drawable.icon4hlt);

        } else {
            seatdirnbtn.setBackgroundResource(R.drawable.icon4);
        }

        isclick = !isclick; 
    }

};

回答1:

Try this change:

if (isclick) {  
        seatdirnbtn.setBackgroundResource(R.drawable.icon4hlt);   
        editor.clear();
        editor.putInt("sharedPreferences", 2).commit();
    }
else {
        seatdirnbtn.setBackgroundResource(R.drawable.icon4);   
        editor.clear();
        editor.putInt("sharedPreferences", 1).commit();
}

回答2:

Here's what i meant:

boolean[] btnBool = new boolean[2]; // number of buttons

private View.OnClickListener listner1 = new View.OnClickListener() {
    public void onClick(View v) {
        toggleBtn(0); //zero refers to which index of the array for button button
        setDrawables();
    }

};

public void onResume() {
    super.onResume();
    toggleAllBtns();
    setDrawables();
}

private void toggleBtn(int index) {
    if(btnBool[index]) {
        btnBool[index] = false;
    } else {
        btnBool[index] = true;
    }
}

private void toggleAllBtns() {
    // first switch the values of the array
    for (int i = 0; i < btnBool.length; i++) {
        if(btnBool[i]) {
            btnBool[i] = false;
        } else {
            btnBool[i] = true;
        }
    }       
}

private void setDrawables() {
    // then set drawables based on values
    if (btnBool[0]) {
        seatdirnbtn.setBackgroundResource(R.drawable.icon4);
    } else {
        seatdirnbtn.setBackgroundResource(R.drawable.icon4hlt);
    }
}

来源：https://stackoverflow.com/questions/13832888/android-shared-preferences-not-saving-the-state-of-the-buttons