Question

我有一个活动，其中y有3个搜索栏，我在每个搜索栏的文本视图中看到每个搜索栏的值。

现在，我想用sharedPreferences存储每个搜索栏的值。我已经尝试过几种方式，但我无法得到它。

我已经知道这样做的正确方法是在调用onPause时保存值，并在调用onResume时恢复它们。

public class Configuration extends Activity implements OnSeekBarChangeListener {

    public TextView progress1;
    public TextView progress2;
    public TextView progress3;
    private SeekBar bar1;
    private SeekBar bar2;
    private SeekBar bar3;

    private int savedProgress1;
    private int savedProgress2;
    private int savedProgress3; 
    private int loadedProgress1;
    private int loadedProgress2;
    private int loadedProgress3;
    private String Key_PROGRESS_1 = "bar1_progress";
    private String Key_PROGRESS_2 = "bar2_progress";
    private String Key_PROGRESS_3 = "bar3_progress";

    SharedPreferences mPreferences;
    SharedPreferences.Editor editor;



    /*********************
     * 
     * ONCREATE
     * 
     ********************/


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.configuracion2);



        bar1 = (SeekBar)findViewById(R.id.fast_bar); //make seekbar object
        bar1.setOnSeekBarChangeListener(this);   //set seekbar listener 
        progress1 = (TextView)findViewById(R.id.salida1);

        bar2 = (SeekBar)findViewById(R.id.climb_bar);
        bar2.setOnSeekBarChangeListener(this);      
        progress2 = (TextView)findViewById(R.id.salida2);

        bar3 = (SeekBar)findViewById(R.id.platform_bar);
        bar3.setOnSeekBarChangeListener(this);      
        progress3 = (TextView)findViewById(R.id.salida3);


        mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        editor = mPreferences.edit();



    }


    public void onProgressChanged(SeekBar bar, int progress, boolean fromUser) {
        Log.v("", "" + bar);
        switch (bar.getId()) {  
            case R.id.fast_bar:
                progress1.setText(progress + "%");
                break;
            case R.id.climb_bar:
                progress2.setText(progress + "%");
                break;
            case R.id.platform_bar:
                progress3.setText(progress + "%");
                break;
        }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {     
    }   
     @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        seekBar.setSecondaryProgress(seekBar.getProgress());    
    }




     protected void onResume() {    
         super.onResume();

             loadedProgress1 = mPreferences.getInt("Key_PROGRESS_1", 0);
             bar1.setProgress(loadedProgress1);         

             loadedProgress2 = mPreferences.getInt("Key_PROGRESS_2", 0);
             bar2.setProgress(loadedProgress2);

             loadedProgress2 = mPreferences.getInt("Key_PROGRESS_3", 0);
             bar3.setProgress(loadedProgress3);

     }




     protected void onPause(/*SeekBar seekBar*/) {
        super.onPause();

                savedProgress1 = bar1.getProgress();
                editor.putInt(Key_PROGRESS_1, savedProgress1);
                savedProgress2 = bar2.getProgress();
                editor.putInt(Key_PROGRESS_2, savedProgress2);
                savedProgress3 = bar3.getProgress();
                editor.putInt(Key_PROGRESS_3, savedProgress3);
                editor.commit();


     }

}

Answer 1

不要将同一个SharedPreferences.Editor对象保留为私有成员。

在mPreferences.edit()内致电onPause()：

SharedPreferences.Editor editor = mPreferences.edit();
savedProgress1 = bar1.getProgress();
editor.putInt(Key_PROGRESS_1, savedProgress1);
savedProgress2 = bar2.getProgress();
editor.putInt(Key_PROGRESS_2, savedProgress2);
savedProgress3 = bar3.getProgress();
editor.putInt(Key_PROGRESS_3, savedProgress3);
editor.commit();

此外，它无法正常工作，因为您在"Key_PROGRESS_X"方法中使用字符串Key_PROGRESS_X而不是变量onResume()。

保存多个Seekbar共享首选项

1 个答案: