0
我正在開發一個應用程序，它有一個由列表視圖（Home Activity）組成的主屏幕。用戶單擊列表項目，新的活動開始命名爲Topic.This活動也包含列表視圖。 Home設置爲Topic的父級活動。android activity stack-back navigation
現在在Topic類中，我再次使用intent調用Topic類。
因此，用戶點擊Home活動中的一個列表項，這會打開一個新的Topic活動。用戶再次單擊列表項，並且創建另一個新的活動Topic，因此我們處於第r級。我的應用程序在這裏工作的很好，但作爲主題的家是家，所以只要我按回或按鈕，不管我在我的應用程序中的位置，它總是打開的Home類。
如何處理這個問題，以便所有用戶都可以遍歷每個活動。
的代碼下面給出：
Home.java
package com.example.guninder.home;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import java.util.List;
import static android.widget.AdapterView.*;
public class Home extends AppCompatActivity implements FetchDataListener {
private ProgressDialog dialog;
private ListView HomeListview;
private DrawerLayout home_drawer_layout;
private ListView Menu_option_list;
private String[] Menu_list;
private ActionBarDrawerToggle drawerToggle;
private ApplicationAdaptor adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
HomeListview = (ListView) findViewById(R.id.listView1);
itemClickListener(HomeListview);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
Menu_list = getResources().getStringArray(R.array.Menu_options);
home_drawer_layout = (DrawerLayout) findViewById(R.id.home_drawable);
Menu_option_list = (ListView) findViewById(R.id.home_menu_option);
Menu_option_list.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1, Menu_list));
// home_Toolbar.setNavigationIcon(R.drawable.ic_drawer);
drawerToggle = new ActionBarDrawerToggle(this, home_drawer_layout, R.string.drawer_open, R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
}
};
drawerToggle.setDrawerIndicatorEnabled(true);
home_drawer_layout.setDrawerListener(drawerToggle);
initView();
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main_activity_actions, menu);
return true;
}
private void initView() {
// show progress dialog
dialog = ProgressDialog.show(this, "", "Loading...");
// String url = "http://dexterous.comuv.com/connect.php";
String url = "http://192.168.0.25/connect.php";
FetchDataTask task = new FetchDataTask(this);
task.execute(url,null);
}
@Override
public void onFetchComplete(List<Application> data) {
// dismiss the progress dialog
if (dialog != null) dialog.dismiss();
// create new adapter
adapter = new ApplicationAdaptor(this, data);
HomeListview.setAdapter(adapter);
// set the adapter to list
//setListAdapter(adapter);
}
public void onPostCreate(Bundle savedInstanceState){
super.onPostCreate(savedInstanceState);
drawerToggle.syncState();
}
@Override
public void onFetchFailure(String msg) {
// dismiss the progress dialog
if (dialog != null) dialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
if(drawerToggle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
public void itemClickListener(final ListView HomeListview) {
HomeListview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Application app = adapter.getItem(position);
Intent intent = new Intent(Home.this, Topic.class);
intent.putExtra("topic_name",app.getTitle());
intent.putExtra("topic_id", app.getTopic_id());
intent.putExtra("Content", app.getParentContent());
Toast toast=Toast.makeText(Home.this,app.getParentContent(),Toast.LENGTH_LONG);
startActivity(intent);
}
});
}
}
Topic.java
package com.example.guninder.home;
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
public class Topic extends AppCompatActivity implements FetchDataListener {
String topicName, ParentContent;
int topic_id;
//TextView txv;
ProgressDialog Topicdialog;
ListView topiclistView;
ApplicationAdaptor tAdaptor;
TextView txv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_topic);
Bundle extras = getIntent().getExtras();
if (extras == null) {
topicName = null;
}
topicName = extras.getString("topic_name");
topic_id = extras.getInt("topic_id");
ParentContent = extras.getString("Content");
txv = (TextView) findViewById(R.id.content);
txv.setMovementMethod(ScrollingMovementMethod.getInstance());
if (ParentContent.isEmpty()) {
txv.setVisibility(txv.GONE);
} else {
txv.setText(ParentContent);
}
setTitle(topicName);
topiclistView = (ListView) findViewById(R.id.topiclistView1);
itemClickListener(topiclistView);
topicinitView();
}
@Override
public void onPause(){
super.onPause();
}
public void onResume(){
super.onResume();
}
private void topicinitView() {
// show progress dialog
Topicdialog = ProgressDialog.show(this, "", "Loading...");
// String url = "http://dexterous.comuv.com/Topic.php";
String url = "http://192.168.0.25/Topic.php";
FetchDataTask task = new FetchDataTask(this);
task.execute(url, String.valueOf(topic_id));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_topic, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onFetchComplete(List<Application> data) {
if (Topicdialog != null) Topicdialog.dismiss();
// create new adapter
tAdaptor = new ApplicationAdaptor(this, data);
topiclistView.setAdapter(tAdaptor);
// set the adapter to list
//setListAdapter(adapter);
}
@Override
public void onFetchFailure(String msg) {
// dismiss the progress dialog
if (Topicdialog != null) Topicdialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
public void itemClickListener(final ListView TopicListview) {
TopicListview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Application app = tAdaptor.getItem(position);
if (app.getChildExist()) {
Intent intent = new Intent(Topic.this, Topic.class);
intent.putExtra("topic_name", app.getTitle());
intent.putExtra("topic_id", app.getTopic_id());
intent.putExtra("Content", app.getParentContent());
// Toast toast = Toast.makeText(Topic.this, app.getTopic_id(), Toast.LENGTH_LONG);
//toast.show();
startActivity(intent);
finish();
}
}
});
}
}
的AndroidManifest.xml提前
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.guninder.home" >
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Home"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Topic"
android:label="@string/title_activity_topic"
android:parentActivityName=".Home" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.guninder.home.Home" />
</activity>
<activity
android:name=".SetNotification"
android:label="@string/title_activity_set_notification"
android:theme="@android:style/Theme.Dialog" >
</activity>
</application>
</manifest>
請help.Thanks
感謝兄弟....工作 – sandhu