将数据从一个活动发送到另一类（非活动）

Question

I want to send data from one activity to another class but the second class is not an activity. It extends Framelayout.

if (imageHolder1 != null) {
        FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
                Gravity.CENTER);
        ImageCell newView = new ImageCell(this);
        resourceId = R.drawable.tile;
        newView.setBackgroundResource(resourceId);
        // newView.setImageResource(resourceId);
        imageHolder1.addView(newView, lp);
        TextView tv =newView.getTextView();
        tv.setText("A");
        SharedPreferences pref = getSharedPreferences("A", MODE_WORLD_WRITEABLE);
        Editor edt = pref.edit();
        edt.putString("A", tv.toString());
        edt.commit();
        newView.getPointTxtView().setText("5");

        newView.mEmpty = false;
        newView.mCellNumber = -1;
        mLastNewCell = newView;
        mImageCount++;

        newView.setOnClickListener(this);
        newView.setOnLongClickListener(this);
        newView.setOnTouchListener(this);

    }

if (imageHolder2 != null) {
            FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
                    LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,
                    Gravity.CENTER);
            ImageCell newView = new ImageCell(this);
            resourceId = R.drawable.tile;
            // newView.setImageResource(resourceId);
            newView.setBackgroundResource(resourceId);
            imageHolder2.addView(newView, lp);
//          newView.getTextView().setText("B");
            TextView tv =newView.getTextView();
            tv.setText("B");
            SharedPreferences pref = getSharedPreferences("A", MODE_PRIVATE);
            Editor edt = pref.edit();
            edt.putString("A", (String) tv.getText());
            edt.commit();
            newView.getPointTxtView().setText("2");

            newView.mEmpty = false;
            newView.mCellNumber = -1;
            mLastNewCell = newView;
            mImageCount++;

            newView.setOnClickListener(this);
            newView.setOnLongClickListener(this);
            newView.setOnTouchListener(this);

        }

Here my another class

pref = getContext().getSharedPreferences("A", Context.MODE_PRIVATE);


    textView.setText(pref.getString("A", null));
    Log.e("ad", "awd" + pref.getString("A", null));
    Log.i("Position:", "" + mCellNumber);

    int column = mCellNumber % total_col;
    int row = mCellNumber / total_col;
    Log.i("Column:", "" + column);
    Log.i("Row:", "" + row);

But i am get android.widget.textview as my text....
Now the problem is in another class sharedpreference is not working because it is not an activity. Hope to receive help from someone.

Answer 1

Try,

SharedPreferences pref = getContext().getSharedPreferences("A", Context.MODE_WORLD_WRITEABLE);

Instead of using

Editor edt = pref.edit();
edt.putString("A", tv.toString());
edt.commit();

use

Editor edt = pref.edit();
edt.putString("A", tv.getText().toString());
edt.commit();

Answer 2

SharedPreferences object in any Layout class

this.getContext().getSharedPreferences("A", MODE_WORLD_WRITEABLE);

Please make sure Context should be same,which one you used for saving any object in SharedPreferences...Hope this will help.

Answer 3

you can pass values by constrictor like this

public class YourClass extends FrameLayout {

private String value;

public YourClass(Context context, String value) {
    super(context);
    this.value = value;
}

public YourClass(Context context, AttributeSet attrs, String value) {
    super(context, attrs);
    this.value = value;
}

public YourClass(Context context, AttributeSet attrs, int defStyle, String value) {
    super(context, attrs, defStyle);
    this.value = value;
}

}

or you can create class extend Application and define SharedPreferences on it like this

public class YourClass extends Application {

private static SharedPreferences sharedPreferences;

public static SharedPreferences getSharedPreferences() {
    return sharedPreferences;
}

@Override
public void onCreate() {
    super.onCreate();
    YourClass.sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext());
}

}

then, you can call SharedPreferences like this

SharedPreferences sharedPreferences = YourClass.getSharedPreferences();
sharedPreferences.getString("","");
YourClass.getSharedPreferences().getString("","");

and be sure to set application name in AndroidManifest.xml like this

<application
        android:name=".YourClass" .... />

you can call SharedPreferences anywhere on project

Answer 4

You can use SharedPreference in non-Activity class.
SharedPreference is related to Context . So, The solution is:

1. Define a static Context class in an Activity class.

   public static Context mAppContext;

2. Initialize the mAppContext in using the getApplicationContext method.

   public void onCreate() { mAppContext= getApplicationContext(); }

3. Get the SharedPreferences with the YourActivity.mAppContext .

   SharedPreferences prefs = YourActivity.mAppContext.getSharedPreferences("A", MODE_WORLD_WRITEABLE);

Answer 5

Create a static object in other class while creating instance of that class setvalue of that object

For eg:

  XYZ xyz=new XYZ(context);
  xyz.somestaticvariable=somevalue;

Also you are doing a simple mistake you are using tv.toString(); instead use tv.getText();

Answer 6

You don't care about your class is activity or not. Because getSharedPreference() is a method of Context class.

Change

SharedPreferences pref = getSharedPreferences("A", MODE_WORLD_WRITEABLE);

to

SharedPreferences pref = getContext().getSharedPreferences("A", MODE_WORLD_WRITEABLE);