アプリケーションA->B->C->Dに4つのアクティビティがあります。
Activityクラスを拡張する独自のクラスMyActivityを作成します。このクラスは、アクティビティスタックを処理するために作成します。このクラスには、addActivitiyTostack（）とgetActivityFromStack（）の2つのメソッドがあります。アクティビティを格納するためにスタックを使用しました。
他のすべてのアクティビティは、このクラスを拡張します。インテントを使用してあるアクティビティから別のアクティビティに移動すると、スタックに追加されました。
そして、私が移動すると、バックワードアクティビティがポップアップ表示されます。スタックにアクティビティを正しく追加できますが、アクティビティをポップするのに問題があります。
また、すべてのアクティビティにログアウトボタンがあります。このボタンのOnClickアプリケーションを閉じたいのですが、どのように実装しますか？Androidでアクティビティスタックを処理する方法は誰でも知っています。
これは私のコードです。
package com.example.iprotect;
import java.util.Enumeration;
import java.util.Stack;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class MyActivity extends Activity {
private static Stack<Activity> stack = new Stack<Activity>();
static int top=0;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addActivityToStack(this);
}
public static void addActivityToStack(MyActivity myActivity) {
// TODO Auto-generated method stub
stack.push(myActivity);
for (int i =0; i< stack.size() ; i++) {
Activity act=stack.get(i);
Log.i("Element in stack", ""+act);
}
}
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
//getActivityFromStack();
//logoutFromApplication();
}
public static void logoutFromApplication() {
// TODO Auto-generated method stub
Enumeration<Activity> enm=stack.elements();
while(enm.hasMoreElements())
{
Activity act=enm.nextElement();
stack.pop();
}
}
public static Activity getActivityFromStack() {
return stack.pop();
}
}
A->
public class WebServiceActivity extends MyActivity{
EditText editText1, editText2;
Button button;
String response = "";
String email, password;
public final Pattern EMAIL_ADDRESS_PATTERN = Pattern
.compile(".+@.+\\.[a-z]+");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText1 = (EditText) findViewById(R.id.etEmail);
final EditText editText2 = (EditText) findViewById(R.id.etPassword);
button = (Button) findViewById(R.id.loginButton);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (TextUtils.isEmpty(editText1.getText().toString())) {
Toast.makeText(getApplicationContext(),
"please enter email id", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(editText2.getText().toString())) {
Toast.makeText(getApplicationContext(),
"please enter passwod", Toast.LENGTH_SHORT).show();
} else {
Boolean bool = EMAIL_ADDRESS_PATTERN.matcher(
editText1.getText().toString()).matches();
if (bool == true) {
} else {
Toast.makeText(getApplicationContext(),
"Invalid email id", Toast.LENGTH_SHORT).show();
}
email = editText1.getText().toString();
password = editText2.getText().toString();
// final ProgressDialog pd = ProgressDialog.show(
// WebServiceActivity.this, "Calling webservice...",
// "Please wait...", true, false);
final ProgressBar bar = (ProgressBar) findViewById(R.id.progressBar2);
bar.setVisibility(View.VISIBLE);
new AsyncTask<Void, Void, Void>() {
String r;
protected void onPreExecute() {
};
@Override
protected Void doInBackground(Void... params) {
r = invokeWebService();
return null;
};
protected void onPostExecute(Void result) {
bar.setVisibility(View.VISIBLE);
};
}.execute();
}
}
private String invokeWebService() {
String response = "";
try {
WebService webService = new WebService(
"http://sphinx-solution.com/iProtect/api.php?");
Map<String, String> params = new HashMap<String, String>();
params.put("action", "auth");
params.put("email", email);
params.put("password", password);
response = webService.WebGet("auth", params);
JSONObject jsonObject = new JSONObject(response);
String rr = jsonObject.optString("status");
if (TextUtils.equals(rr, "success")) {
Log.e("MSG", "status==success");
Intent intent = new Intent(WebServiceActivity.this,
SecondActivity.class);
//MyActivity.addActivityToStack(WebServiceActivity.this);
intent.putExtra("email", email);
intent.putExtra("password", password);
WebServiceActivity.this.startActivity(intent);
finish();
} else {
Log.e("MSG", "status ==failed");
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
});
}
}
B->
public class SecondActivity extends MyActivity {
ListView listView;
String email1, password1;
ArrayList<JSONStructure> arrayList = new ArrayList<JSONStructure>();
String r;
String r1;
String tablename;
String rows;
JSONObject jsonObject;
String tablename2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_layout);
Intent intent = getIntent();
email1 = intent.getExtras().getString("email");
password1 = intent.getExtras().getString("password");
Button btn1 = (Button) findViewById(R.id.refreshbutton);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final ProgressDialog pd = ProgressDialog.show(
SecondActivity.this, "Refresh List...",
"Please wait...", true, false);
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
pd.dismiss();
r = invokeWebService();
return null;
}
protected void onPostExecute(Void result) {
};
}.execute();
}
});
Button btn = (Button) findViewById(R.id.logoutbutton);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final ProgressDialog pd = ProgressDialog.show(
SecondActivity.this, "Calling webservice...",
"Please wait...", true, false);
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
pd.dismiss();
return null;
}
@Override
protected void onPostExecute(Void result) {
Intent intent = new Intent(SecondActivity.this,
WebServiceActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
SecondActivity.this.startActivity(intent);
}
}.execute();
}
});
listView = (ListView) findViewById(R.id.listview1);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view,
int position, long id) {
JSONStructure jsonstructure = (JSONStructure) listView
.getAdapter().getItem(position);
final String tablename1 = jsonstructure.getTableName()
.toString();
Intent intent = new Intent(SecondActivity.this,
ProgressBarActivity.class);
//MyActivity.addActivityToStack(SecondActivity.this);
intent.putExtra("tablename", tablename1);
intent.putExtra("Rows", rows);
intent.putExtra("email", email1);
intent.putExtra("password", password1);
SecondActivity.this.startActivity(intent);
}
});
new AsyncTask<Void, Void, Void>() {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
r = invokeWebService();
try {
JSONArray jsonArray = new JSONArray();
JSONObject jsonObject = new JSONObject(r);
jsonArray = jsonObject.getJSONArray("Records");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject c = jsonArray.getJSONObject(i);
tablename = c.optString("TABLE NAME");
rows = c.optString("Rows");
JSONStructure jsonStructure = new JSONStructure();
jsonStructure.setTableName(tablename);
jsonStructure.setRows(rows);
arrayList.add(jsonStructure);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
if (arrayList != null && arrayList.size() > 0) {
MyAdapter adapter = new MyAdapter(SecondActivity.this,
arrayList);
listView.setAdapter(adapter);
}
}
}.execute();
}
private String invokeWebService() {
String response = "";
try {
WebService webService = new WebService(
"http://sphinx-solution.com/iProtect/api.php?");
Map<String, String> params = new HashMap<String, String>();
params.put("action", "getTables");
params.put("email", email1);
params.put("password", password1);
response = webService.WebGet("getTables", params);
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
}
C->
public class ThirdActivity extends MyActivity {
String tablename1, row1, json1;
ArrayList<JSONStructure> arrayList = new ArrayList<JSONStructure>();
JSONArray jsonArray, jsonArray2;
JSONObject jsonObject;
String row;
String email1, password1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.third_layout);
ListView listView = (ListView) findViewById(R.id.listview2);
TextView textView = (TextView) findViewById(R.id.title_textview);
Intent intent = getIntent();
tablename1 = intent.getExtras().getString("tablename");
row = intent.getExtras().getString("Rows");
textView.setText(tablename1);
json1 = intent.getExtras().getString("Json");
email1 = intent.getExtras().getString("email");
password1 = intent.getExtras().getString("password");
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
return null;
}
@Override
protected void onPostExecute(Void result) {
Button button = (Button) findViewById(R.id.goback);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(ThirdActivity.this,
SecondActivity.class);
MyActivity.getActivityFromStack();
intent.putExtra("email", email1);
intent.putExtra("password", password1);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
ThirdActivity.this.startActivity(intent);
}
});
}
}.execute();
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view,
final int position, long id) {
final ProgressDialog pd = ProgressDialog.show(
ThirdActivity.this, "Calling webservice...",
"Please wait...", true, false);
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... paramArrayOfParams) {
pd.dismiss();
try {
jsonObject = new JSONObject(json1);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
Intent intent = new Intent(ThirdActivity.this,
FinalActivity.class);
//MyActivity.addActivityToStack(ThirdActivity.this);
intent.putExtra("tablename", tablename1);
intent.putExtra("Json", jsonObject.toString());
intent.putExtra("Row", position);
intent.putExtra("email", email1);
intent.putExtra("password", password1);
ThirdActivity.this.startActivity(intent);
}
}.execute();
}
});
try {
JSONObject jsonObject = new JSONObject(json1);
JSONArray jsonArray = new JSONArray();
jsonArray = jsonObject.getJSONArray("FirstThree");
jsonArray2 = jsonObject.getJSONArray("Color");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject c = jsonArray.getJSONObject(i);
String one = c.optString("One");
String two = c.optString("Two");
String three = c.optString("Three");
JSONObject c1 = jsonArray2.getJSONObject(i);
String color = c1.optString("color");
JSONStructure jsonStructure = new JSONStructure();
jsonStructure.column1 = one;
jsonStructure.column2 = two;
jsonStructure.column3 = three;
jsonStructure.setColumn1(one);
jsonStructure.setColumn2(two);
jsonStructure.setColumn3(three);
jsonStructure.setColor(color);
arrayList.add(jsonStructure);
Log.e("one", c.optString("One"));
Log.e("two", c.optString("Two"));
Log.e("three", c.optString("Three"));
Log.e("color", c1.optString("color"));
}
} catch (Exception e) {
e.printStackTrace();
}
if (arrayList != null && arrayList.size() > 0) {
MyAdapter1 adapter1 = new MyAdapter1(ThirdActivity.this, arrayList);
listView.setAdapter(adapter1);
}
Button btn = (Button) findViewById(R.id.logoutbutton);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final ProgressDialog pd = ProgressDialog.show(
ThirdActivity.this, "Calling webservice...",
"Please wait...", true, false);
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
pd.dismiss();
return null;
}
@Override
protected void onPostExecute(Void result) {
Intent intent = new Intent(ThirdActivity.this,
WebServiceActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
ThirdActivity.this.startActivity(intent);
super.onPostExecute(result);
}
}.execute();
}
});
}
}