Question

我已经实现了一个带有多个布局的多个复选框的应用程序。当用户取消选中相关的复选框时，我看不到布局。然后我尝试在用户重新启动应用程序时保存内容和设置。

我已经实现了如下代码：

public class MultipleControllsActivity extends Activity {
/** Called when the activity is first created. */

LinearLayout l1,l2,l3;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    l1 = ((LinearLayout)findViewById(R.id.linearLayout1));
    l2 = ((LinearLayout)findViewById(R.id.linearLayout2));
    l3 = ((LinearLayout)findViewById(R.id.linearLayout3));

    ((CheckBox)findViewById(R.id.checkBox1)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if(!isChecked){
            l1.setVisibility(View.GONE);    
            }
        }
    });


    ((CheckBox)findViewById(R.id.checkBox2)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            l2.setVisibility(View.GONE);
        }
    });


    ((CheckBox)findViewById(R.id.checkBox3)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            l3.setVisibility(View.GONE);
        }
    });


    ((Button)findViewById(R.id.saveTemp)).setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            //Save the content code here

        }
    });

}

}

当我点击saveTemp按钮然后我想保存内容，如果用户重新启动应用程序，则会显示保存的内容。

请任何人帮助我......

Answer 1

您可以使用

SharedPreferences

http://developer.android.com/reference/android/content/SharedPreferences.html

使用此： -

     public class MultipleControllsActivity extends Activity {
    /** Called when the activity is first created. */

    LinearLayout l1,l2,l3;



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     SharedPreferences pref_settings;
    pref_settings = getSharedPreferences("DATA", Context.MODE_PRIVATE);
        l1 = ((LinearLayout)findViewById(R.id.linearLayout1));
        l2 = ((LinearLayout)findViewById(R.id.linearLayout2));
        l3 = ((LinearLayout)findViewById(R.id.linearLayout3));
l1.setVisibility(pref_settings.getInt("l1", 0));
l2.setVisibility(pref_settings.getInt("l2", 0));
l2.setVisibility(pref_settings.getInt("l3", 0));

        ((CheckBox)findViewById(R.id.checkBox1)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                if(!isChecked){
                l1.setVisibility(View.GONE);    
                }
            }
        });


        ((CheckBox)findViewById(R.id.checkBox2)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                l2.setVisibility(View.GONE);
            }
        });


        ((CheckBox)findViewById(R.id.checkBox3)).setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                l3.setVisibility(View.GONE);
            }
        });


        ((Button)findViewById(R.id.saveTemp)).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                SharedPreferences pref_settings;
    pref_settings = getSharedPreferences("DATA", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = pref_settings.edit();


                editor.putInt("l1", l1.getVisibility());
    editor.putInt("l2", l2.getVisibility());
    editor.putInt("l3", l3.getVisibility());

                editor.commit();

            }
        });

    }

Answer 2

以下是我使用Multiple Choice ListView实现的示例，即使我不直接使用CheckBoxes，您可能会对如何继续进行一些了解。您可以像这样保存您的偏好......

public void SaveSelections() {
    SharedPreferences sp = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor prefEditor = sp.edit();
    String savedItems = getSavedItems();
    prefEditor.putString(LOAD_LIST, savedItems);
    prefEditor.commit();
}

private String getSavedItems() {
    String savedItems = "";
    int count = listView.getAdapter().getCount();
    for (int i = 0; i < count; i++) {
        if (listView.isItemChecked(i)) {
            if (savedItems.length() > 0) {
                savedItems += "," + listView.getItemAtPosition(i);
            } else {
                savedItems += listView.getItemAtPosition(i);
            }
        }
    }
    return savedItems;
}

以下是加载选择的方法..

private void LoadSelections() {
        SharedPreferences sp = getPreferences(MODE_PRIVATE);
        if (sp.contains(LOAD_LIST)) {
            String savedItems = sp.getString(LOAD_LIST, "");
            this.selectedItems.addAll(Arrays.asList(savedItems.split(",")));
            int count = this.listView.getAdapter().getCount();
            for (int i = 0; i < count; i++) {
                String currentItem = (String) listView.getAdapter().getItem(i);
                if (this.selectedItems.contains(currentItem)) {
                    this.listView.setItemChecked(i, true);
                }

            }
        }
    }

然后在OnCreate中调用LoadSelections（），这样......

Bundle b = new Bundle();
checkedItems = listView.getCheckedItemPositions();
final int checkedItemsCount = checkedItems.size();
lst = new ArrayList<String>();
for (int i = 0; i < checkedItemsCount; ++i) {
// This tells us the item position we are looking at
final int position = checkedItems.keyAt(i);
final String str2 = (String) listView.getItemAtPosition(position);
lst.add(str2);
}
SaveSelections();

最后在OnCreate中调用LoadSelections，就像这样

LoadSelections（）;

如何保存android内容视图的修改内容？

2 个答案: