android onclick of button如何在sharedpreference中保存自定义复选框状态，并在app重启后获取它

Question

我有一个所有安装应用程序的列表视图。 我现在使用自定义适配器问题是这样我想在用户退出应用程序时保存我的复选框状态（已选中或未选中），以便我可以在应用程序重新启动时重新加载此状态。 这是我的代码

public class Listadapter extends BaseAdapter {
    private Context mContext;
    private List<ApplicationInfo> mListAppInfo;
    private PackageManager mPackManager;
    private ArrayList<Boolean> checkList = new ArrayList<Boolean>();
    CheckBox checkBox;
    boolean index[];
    boolean[] itemChecked;
    public Listadapter(Context applicationContext, List<ApplicationInfo> installedApplication, PackageManager packageManager) {
        //super(applicationContext,textViewResourceId,installedApplication);
            super();
            this.mContext = applicationContext;
            this.mListAppInfo = installedApplication;
            index = new boolean[installedApplication.size()];
            this.mPackManager = packageManager;
            for (int i = 0; i < installedApplication.size(); i++) {
            checkList.add(false);
            itemChecked = new boolean[installedApplication.size()];
            }
    }
    private class ViewHolder {
        ImageView ivAppIcon;
        TextView tvAppName;
        TextView tvPkgName;
        CheckBox checkBox;
    }
    @Override
    public int getCount() {
        return mListAppInfo.size();
        //return ((null != mListAppInfo) ? mListAppInfo.size() : 0);
    }

    @Override
    public Object getItem(int position) {
       // index = new boolean[mListAppInfo.size()];
        return mListAppInfo.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // get the selected entry

        final ViewHolder holder;

      //  LayoutInflater inflater = (LayoutInflater) mContext.getLayoutInflater();
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService( Context.LAYOUT_INFLATER_SERVICE );

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
        // reference to convertView
            holder.tvAppName = (TextView) convertView
                    .findViewById(R.id.textView1);
            holder.tvPkgName = (TextView) convertView
                    .findViewById(R.id.textView);
            holder.checkBox = (CheckBox) convertView
                    .findViewById(R.id.checkBox1);
            holder.ivAppIcon = (ImageView) convertView
                    .findViewById(R.id.imageView);

            convertView.setTag(holder);
            // holder.ck1.setTag(packageList.get(position));

        }
             else {

                holder = (ViewHolder) convertView.getTag();
            }
        final ApplicationInfo entry = mListAppInfo.get(position);

        holder.ivAppIcon.setImageDrawable(entry.loadIcon(mPackManager));
        holder.tvAppName.setText(entry.loadLabel(mPackManager));
        holder.tvPkgName.setText(entry.packageName);
        holder.checkBox.setChecked(false);


        holder.checkBox.setChecked(false);

        if (itemChecked[position])
            holder.checkBox.setChecked(true);
        else
            holder.checkBox.setChecked(false);

        holder.checkBox.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (holder.checkBox.isChecked())
                    itemChecked[position] = true;
                else
                    itemChecked[position] = false;
            }
        });
        return convertView;
    }

}

这是我的主要活动代码

public class MainActivity extends Activity implements OnItemClickListener {

    ListView apps;
    PackageManager packageManager;
    ArrayList<String> checkedValue;
    Button bt1;
    private ShareActionProvider mShareAction;
    ApplicationInfo pi = new ApplicationInfo();
    public static final String PREF_PROFILE3 = "pref_profile3";
    public static final String PROFILE3 = "profile3";
    Context context = this;
    SharedPreferences pkg;
    CheckBox cb;

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

        needPermissionForBlocking(context);

        bt1 = (Button) findViewById(R.id.button1);
        apps = (ListView) findViewById(R.id.listView1);
        apps.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

        packageManager = getPackageManager();
        checkedValue = new ArrayList<String>();

        Listadapter Adapter = new Listadapter(this, Utilities.getInstalledApplication(this), packageManager);

        apps.setAdapter(Adapter);
        apps.setOnItemClickListener(this);

        bt1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                Toast.makeText(MainActivity.this, "all" + checkedValue, Toast.LENGTH_LONG).show();
            }
        });
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) {
        // TODO Auto-generated method stub
        cb = (CheckBox) v.findViewById(R.id.checkBox1);
        TextView tv = (TextView) v.findViewById(R.id.textView);
        pi = (ApplicationInfo) arg0.getItemAtPosition(position);
        cb.performClick();
        if (cb.isChecked()) {
            checkedValue.add(tv.getText().toString());

        } else if (!cb.isChecked()) {
            checkedValue.remove(tv.getText().toString());
        }
    }
}

在我的mainactivity中，当我选中复选框并单击按钮时，我有一个我想要的按钮，它保存所有复选框状态并在活动打开时重新加载状态。

Answer 1

请尝试使用它

SharedPreferences preferences = getSharedPreferences(getString("YOUR_APP_NAME"), MODE_PRIVATE);
SharedPreferences.Editor edit = preferences.edit();
edit.putBoolean("checkbox_" + CHECKBOX_INDEX, CHECKBOX_IS_CHECKED);
edit.commit();

/* ----- after ----- */
SharedPreferences preferences = getSharedPreferences(getString("YOUR_APP_NAME"), MODE_PRIVATE);
preferences.getBoolean("checkbox_" + CHECKBOX_INDEX, false);

我认为本教程将帮助您提高您的Android技能

将方法添加到Listadapter

public void setItemChecked(boolean[] items) {
   itemChecked = items;
}

并使用此代码从MainActivity中调用此方法

boolean[] items = new boolean[Utilities.getInstalledApplication(this).size()];
for (int i = 0; i < Utilities.getInstalledApplication(this).size(); ++i) {
    items[i] = preferences.getBoolean("checkbox_" + i,false);
}

之后

Listadapter Adapter = new Listadapter(this, Utilities.getInstalledApplication(this), packageManager);

叫这个

Adapter.setItemChecked(items);

Answer 2

复选框的监听器是：

checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

        }
    });