我有一个用于列表视图的CustomAdapter，我需要使用SharedPreferences从布尔数组中保存所有复选框状态，我想保存技巧的名称（一个字符串数组）作为键和每个的状态特技。
我想到的SharedPreferences示例：
（“技巧名称”，false / true） （“ATW - 环游世界”，false / true）
每次用户更改任何状态时，都需要在SharedPreference内更新所点击的技巧。
我尝试了下面的两种方法进行测试，但它不起作用，我不知道如何使这项工作。
storeArray（）和loadArray（）。
public class CustomAdapter0 extends BaseAdapter {
public CustomAdapter0(String[] tricks, Context context) {
this.tricks = tricks;
this.context = context;
isClicked = new boolean[tricks.length];
for(int i = 0; i < isClicked.length; i++) isClicked[i] = false;
}
private String[] tricks;
private Context context;
private boolean[] isClicked;
private LayoutInflater layoutInflater;
@Override
public int getCount() {
return tricks.length;
}
@Override
public Object getItem(int i) {
return tricks[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
View row = convertView;
if(convertView == null){
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.custom_listview_tricks, null);
}
TextView textView = row.findViewById(R.id.name_xml);
ImageButton imageButton = row.findViewById(R.id.unmastered_xml);
textView.setText(tricks[i]);
if (isClicked[i]) imageButton.setBackgroundResource(R.drawable.mastered);
else imageButton.setBackgroundResource(R.drawable.unmastered);
**loadArray**(tricks[i], context);
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ImageButton clickedView = (ImageButton) view;
int clickedPosition = (int)clickedView.getTag();
isClicked[clickedPosition] = !isClicked[clickedPosition];
notifyDataSetChanged();
**storeArray**(isClicked, tricks, context);
}
});
imageButton.setTag(i);
return row;
}
public boolean **storeArray**(boolean[] array, String[] arrayName, Context mContext) {
SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt(arrayName +"_size", array.length);
for(int i=0;i<array.length;i++)
editor.putBoolean(arrayName + "_" + i, array[i]);
return editor.commit();
}
public Boolean[] **loadArray**(String arrayName, Context mContext) {
SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0);
int size = prefs.getInt(arrayName + "_size", 0);
Boolean array[] = new Boolean[size];
for(int i=0;i<size;i++)
array[i] = prefs.getBoolean(arrayName + "_" + i, false);
return array;
}
}
TricksActivity with Array of Boolean
public class TricksActivity extends AppCompatActivity {
private String[] lower = {
"ATW - Around the World",
"HTW - Hop the World",
"Crossover",
"Crossover 360",
"Simple Crossover",
"Reverse Crossover",
"KATW - Knee Around the World",
"KHTW - Knee Hop the World",
"Toe Bounce",
"Reverse Toe Bounce",
"Air Jester",
"ATL - Around the Leg",
"Hell Juggles",
"AATW - Abbas Around the World",
"HATW - Half Around the World",
"TATW - Touzani Around the World",
"MATW - Mitchy Around the World",
"ATATW - AlternateTouzani Around the World",
"AMATW - Alternate Mitchy Around the World",
"HMATW - Homie Mitchy Around the World",
"HTATW - Homie Touzani Around the World",
"KAATW - Knee Abbas Around the World",
"KMATW - Knee Mitchy Around the World",
"KTATW - Knee Touzani Around the World",
"LEBATW - Lebioda Around the World",
"LATW - Lemmens Around the World",
"MAATW - Mitchy Abbas Around the World",
"RATW - Ratinho Around the World",
"ATL - Around the Leg",
"360 ATW",
"Clipper",
"JATOW - Joshua Around the Oppositive World",
"Sagami Aroudn the World",
"YATW - Yosuke Around the World",
"Timo ATW",
"Knee Timo ATW",
"Air Jester",
"Eclipse",
"Half New Shit",
"ALATW - Alternate Lemmens Around the World",
"BATW - Beck Around the World",
"HJATW - Homie Jay Around the World",
"HMAATW - Homie Mitchy Abbas Around the World",
"HTAATW - Homie Touzani Abbas Around the World",
"KAMATW - Knee Alternate Mitchy Around the World",
"KATATW - Knee Alternate Touzani Around the World",
"KMAATW - Knee Mitchy Alternate Around the World",
"LAATW - Lemmens Abbas Around the World",
"LMATW - Lemmens Mitchy Around the World",
"LTATW - Lemmens Touzani Around the World",
"Magellan",
"New Shit",
"Palle Trick",
"Reverse Palle Trick",
"Toe Stall",
"Hell Stall",
"Knee Stall",
"Hell Juggles",
"Spin Magic",
"MichRyc Move",
"AHMATW - Alternate Homie Mitchy Around the World",
"AHTATW - Alternate Homie Touzani Around the World",
"ALMATW - Alternate Lemmens Mitchy Around the World",
"KLAATW - Knee Lemmens Abbas Around the World",
"SATW - Skora Around the World",
"Skora Move",
"RSATW - Reverse Skora Around the World",
" HTLATW - Homie Touzani Lemmens Around the World",
"SZATW - Szymo Around The World",
"EATW - Eldo Around the World",
"SKATW - Skala Around the World",
"ZATW - Zegan Around the World",
"K3EATW - K3vin Eldo Around the World",
"SKMATW - Skala Mitchy Around the World",
"EMATW - Eldo Mitchy Around the World",
"AEATW - Alternate Eldo Around the World",
"PATW - Palle Around the World",
"PMATW - Palle Mitchy Around the World",
"APATW - Alternate Palle Around the World"
};
private String[] upper = {
"Head Stall",
"Top Head Stall",
"Side Head Stall",
"Shoulder Stall",
"Neck Stall",
"360",
"Chest Stall",
"ATM - Around The Moon",
"Carousel",
"Pavel Roll",
"LIP Stall",
"Arm Roll",
"Nose Stall",
"Neck Flick",
"LATM - Luki Around the Moon",
};
private String[] sitDown = {
"Shin Stall",
"Sole Stall",
"Abdullah",
"Sole Juggle",
"Shin ATW",
"Dimetto"
};
private String[] combosFamosos= {
"CNK NT Combo",
"Skóra NT Combo",
"Palle Combo",
"Palle Combo 2"
};
private ImageView imageView;
private int codigo;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tricks);
Intent intent = getIntent();
codigo = intent.getIntExtra("codigo", 0);
//Toast.makeText(this, ""+codigo, Toast.LENGTH_SHORT).show();
listView = findViewById(R.id.listview_xml);
if (codigo == 0){
CustomAdapter0 customAdapter0 = new CustomAdapter0(lower, TricksActivity.this);
listView.setAdapter(customAdapter0);
}if (codigo == 1){
CustomAdapter0 customAdapter0 = new CustomAdapter0(upper, TricksActivity.this);
listView.setAdapter(customAdapter0);
}if (codigo == 2){
CustomAdapter0 customAdapter0 = new CustomAdapter0(sitDown, TricksActivity.this);
listView.setAdapter(customAdapter0);
}if (codigo == 3){
CustomAdapter0 customAdapter0 = new CustomAdapter0(combosFamosos, TricksActivity.this);
listView.setAdapter(customAdapter0);
}if (codigo == 4){
}
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), VideoActivity.class);
if(codigo == 0){
//Toast.makeText(TricksActivity.this, ""+lower[i], Toast.LENGTH_SHORT).show();
intent.putExtra("trick", lower[i]);
}
if(codigo == 1){
//Toast.makeText(TricksActivity.this, ""+upper[i], Toast.LENGTH_SHORT).show();
intent.putExtra("trick", upper[i]);
}
if(codigo == 2){
//Toast.makeText(TricksActivity.this, ""+sitDown[i], Toast.LENGTH_SHORT).show();
intent.putExtra("trick", sitDown[i]);
}
if(codigo == 3){
//Toast.makeText(TricksActivity.this, ""+combosFamosos[i], Toast.LENGTH_SHORT).show();
intent.putExtra("trick", combosFamosos[i]);
}
startActivity(intent);
}
});
}
}
答案 0 :(得分：0)
试试这个适配器代码：
public class CustomAdapter0 extends BaseAdapter {
public CustomAdapter0(String listname, String[] tricks, Context context) {
this.tricks = tricks;
this.context = context;
isClicked = new boolean[tricks.length];
for(int i = 0; i < isClicked.length; i++) isClicked[i] = false;
this.listname = listname;
}
private String[] tricks;
private Context context;
private boolean[] isClicked;
private LayoutInflater layoutInflater;
private String listname;
@Override
public int getCount() {
return tricks.length;
}
@Override
public Object getItem(int i) {
return tricks[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
View row = convertView;
if(convertView == null){
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.custom_listview_tricks, null);
}
TextView textView = row.findViewById(R.id.name_xml);
ImageButton imageButton = row.findViewById(R.id.unmastered_xml);
textView.setText(tricks[i]);
if (isClicked[i]) imageButton.setBackgroundResource(R.drawable.mastered);
else imageButton.setBackgroundResource(R.drawable.unmastered);
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ImageButton clickedView = (ImageButton) view;
int clickedPosition = (int)clickedView.getTag();
isClicked[clickedPosition] = !isClicked[clickedPosition];
notifyDataSetChanged();
storeArray();
}
});
imageButton.setTag(i);
return row;
}
public boolean storeArray() {
SharedPreferences prefs = context.getSharedPreferences(listname, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
for(int i = 0; i < tricks.length; i++)
editor.putBoolean(tricks[i], isClicked[i]);
return editor.commit();
}
public void loadArray() {
SharedPreferences prefs = context.getSharedPreferences(listname, Context.MODE_PRIVATE);
for(int i = 0; i < tricks.length; i++)
isClicked[i] = prefs.getBoolean(tricks[i], false);
}
}
在Activity中，更改那些用于初始化适配器的if语句，如：
if (codigo == 0){
CustomAdapter0 customAdapter0 = new CustomAdapter0("lower", lower, TricksActivity.this);
listView.setAdapter(customAdapter0);
customAdapter0.loadArray();
}if (codigo == 1){
CustomAdapter0 customAdapter0 = new CustomAdapter0("upper", upper, TricksActivity.this);
listView.setAdapter(customAdapter0);
customAdapter0.loadArray();
}if (codigo == 2){
CustomAdapter0 customAdapter0 = new CustomAdapter0("sitDown", sitDown, TricksActivity.this);
listView.setAdapter(customAdapter0);
customAdapter0.loadArray();
}if (codigo == 3){
CustomAdapter0 customAdapter0 = new CustomAdapter0("combosFamosos", combosFamosos, TricksActivity.this);
listView.setAdapter(customAdapter0);
customAdapter0.loadArray();
}
希望有所帮助！