1）我在回收器视图适配器中使用开关按钮。
2）问题是"上下文"我想在选中或取消选中切换按钮时显示 Toast。
3）我应该在吐司中使用哪个上下文来显示吐司。
我想在切换时显示吐司OnCheckChangeListener
public class ChannelPartenerMyBuddiesAdapter extends RecyclerView.Adapter<ChannelPartenerMyBuddiesAdapter.MyViewHolder> {
// String ChannelPartenerURL = Ipaddress.ChannelPartener();
String Ip = Ipaddress.ipaddress();
String ChannelPartenerURL = Ip + "ChannelPartener.php/";
String TAG = Utils.LogcatTag;
String CBId, CBActive;
ChannelPartenerMyBuddies channelPartenerMyBuddies = new ChannelPartenerMyBuddies();
private List<ChannelPartenerMyBuddiesItom> channelPartenerMyBuddiesItomsList;
private ChannelPartenerMyBuddiesAdapter thisAdapter = this;
View view;
Context context;
Activity activity;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView inputMyCashBuddyID, inputMyCashBuddyName, inputMyCashBuddyMobile, inputMyCashBuddyLocation;
ImageView inputCashBudyprofilPic;
Button buttonEdit, buttonDelete;
Switch mySwitch;
public MyViewHolder(View view) {
super(view);
inputMyCashBuddyID = (TextView) view.findViewById(R.id.mtextMyBuddiesID);
inputMyCashBuddyName = (TextView) view.findViewById(R.id.mtextMyBuddiesName);
inputMyCashBuddyMobile = (TextView) view.findViewById(R.id.mtextMyBuddiesMobile);
inputMyCashBuddyLocation = (TextView) view.findViewById(R.id.mtextMyBuddiesAddress);
buttonDelete = (Button) view.findViewById(R.id.mbtnMyBuddiesDelete);
buttonEdit = (Button) view.findViewById(R.id.mbtnMyBuddiesEdit);
mySwitch = (Switch) view.findViewById(R.id.switch1);
inputCashBudyprofilPic = (ImageView) view.findViewById(R.id.mCashBuddyProfile);
}
}
public ChannelPartenerMyBuddiesAdapter(List<ChannelPartenerMyBuddiesItom> channelPartenerMyBuddiesItomsList) {
this.channelPartenerMyBuddiesItomsList = channelPartenerMyBuddiesItomsList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.channel_partener_my_buddies_itom_list, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(final ChannelPartenerMyBuddiesAdapter.MyViewHolder holder, final int position) {
final ChannelPartenerMyBuddiesItom channelPartenerMyBuddiesItom = channelPartenerMyBuddiesItomsList.get(position);
holder.inputMyCashBuddyID.setText(channelPartenerMyBuddiesItom.getMyBuddiesID());
holder.inputMyCashBuddyName.setText(channelPartenerMyBuddiesItom.getMyBuddiesName());
holder.inputMyCashBuddyMobile.setText(channelPartenerMyBuddiesItom.getMyBiddiesMobile());
holder.inputMyCashBuddyLocation.setText(channelPartenerMyBuddiesItom.getMyBuddiesAdress());
new ImageLoadTask(channelPartenerMyBuddiesItom.getMyBuddiesProfilePic(), holder.inputCashBudyprofilPic).execute();
String CBstatus = channelPartenerMyBuddiesItom.getMyBuddiesActive();
if (CBstatus.equals("y")) {
holder.mySwitch.setChecked(true);
holder.mySwitch.setText("Active");
} else {
holder.mySwitch.setChecked(false);
holder.mySwitch.setText("DActive");
}
holder.mySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean bChecked) {
if (bChecked) {
Toast.makeText(context, "Checked", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(context, "Unchecked", Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public int getItemCount() {
return channelPartenerMyBuddiesItomsList.size();
}
public void CashBuddyActive(final Context context) {
Log.e(TAG, ChannelPartenerURL);
final ProgressDialog pDialog = new ProgressDialog(context);
pDialog.setMessage("Updating Cash Buddy ...");
pDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.POST,
ChannelPartenerURL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
pDialog.hide();
Log.e("Update responce", response);
try {
JSONObject jsonObject = new JSONObject(response);
String Result = jsonObject.getString("code");
Log.e("Upadate Cash Buddy Code", Result);
if (Result.equals("1")) {
Log.e(TAG, "Active Code 1");
Intent i = new Intent(thisAdapter.context, ChannelPartenerMyBuddies.class);
context.startActivity(i);
((Activity) context).finish();
} else {
Toast.makeText(context, "Status not Changed", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, error.getMessage());
pDialog.hide();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("getdata", "updateCashBuddyActiveDeactive");
params.put("insert_CB_ID", CBId);
params.put("insert_CB_status", CBActive);
return params;
}
};
//Adding request to request queue
VolleyAppController.getInstance().addToRequestQueue(stringRequest);
}
public void DeleateCashBuddyStatus(final Context context, final String CashBuddyI) {
Log.e(TAG, ChannelPartenerURL);
Log.e("Deleat ID", CashBuddyI);
final ProgressDialog pDialog = new ProgressDialog(context);
pDialog.setMessage("Updating Cash Buddy ...");
pDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.POST,
ChannelPartenerURL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
pDialog.hide();
Log.e("Update responce", response);
try {
JSONObject jsonObject = new JSONObject(response);
String Result = jsonObject.getString("code");
Log.e("Cash Buddy Code", Result);
if (Result.equals("1")) {
Intent i = new Intent(thisAdapter.context, ChannelPartenerMyBuddies.class);
context.startActivity(i);
((Activity) context).finish();
} else {
Toast.makeText(context, "Cash Buddy no Deleated", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, error.getMessage());
pDialog.hide();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("getdata", "deleatCashBuddy");
params.put("insert_CB_ID", CashBuddyI);
return params;
}
};
//Adding request to request queue
VolleyAppController.getInstance().addToRequestQueue(stringRequest);
}
}
我在日志猫中遇到以下错误
Process: com.jmtechnologies.askuscash, PID: 7741
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.Toast.<init>(Toast.java:106)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.Toast.makeText(Toast.java:263)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at com.jmtechnologies.askuscash.ChannelPartener.ChannelPartenerMyBuddiesAdapter$1.onCheckedChanged(ChannelPartenerMyBuddiesAdapter.java:141)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.CompoundButton.setChecked(CompoundButton.java:154)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.Switch.setChecked(Switch.java:862)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.Switch.toggle(Switch.java:857)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.widget.CompoundButton.performClick(CompoundButton.java:118)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.view.View$PerformClick.run(View.java:20262)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:815)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:104)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.os.Looper.loop(Looper.java:194)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5622)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
01-23 15:19:15.188 7741-7741/com.jmtechnologies.askuscash E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
假设从调用ChannelPartenerMyBuddiesAdapter的位置传递上下文，假设如果您从MainActivity调用此类，那么在MainActivity中编写以下代码
ChannelPartenerMyBuddiesAdapter channelPartenerMyBuddiesAdapter = new ChannelPartenerMyBuddiesAdapter(objectofList<ChannelPartenerMyBuddiesItom>,MainActivity.this);
在您的 ChannelPartenerMyBuddiesAdapter 类中进行了如下更改
public ChannelPartenerMyBuddiesAdapter(List<ChannelPartenerMyBuddiesItom> channelPartenerMyBuddiesItomsList,Context context) {
this.channelPartenerMyBuddiesItomsList = channelPartenerMyBuddiesItomsList;
this.context=context
}
通过添加下面行来设置上下文，它也对我有用
context = compoundButton.getContext();
下面是我更新的代码来显示吐司
setOnCheckedChangeListener
holder.mySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean bChecked) {
context = compoundButton.getContext();
if (bChecked) {
Toast.makeText(context, "Checked", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context, "Unchecked", Toast.LENGTH_LONG).show();
}
}
});
在这里，您可以添加上下文并使用该上下文来显示 Toast
private Context mContext;
public ChannelPartenerMyBuddiesAdapter(List<ChannelPartenerMyBuddiesItom> channelPartenerMyBuddiesItomsList,Context mContext) {
this.channelPartenerMyBuddiesItomsList = channelPartenerMyBuddiesItomsList;
this.mContext=mContext
}