Question

我正在开发一个应用程序，其主屏幕由列表视图（Home Activity）组成。用户点击列表项，新活动开始命名为Topic。此活动也包含列表视图。 Home被设置为主题的父活动。

现在在Topic类中，我再次使用intent调用Topic类。

因此，用户单击Home活动中的列表项，这将打开一个新的Topic活动。用户再次单击列表项，并创建另一个新活动Topic，因此我们处于rd级别。我的应用程序工作正常，直到这里，但作为主题的父母是家庭，所以只要按下或按钮，无论我在我的应用程序中的哪个位置，它始终是打开的Home类。

如何处理此问题，以便所有用户都可以遍历每个活动。

代码如下：

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

<?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>

请帮助。谢谢提前

Answer 1

您可以做的是， 不设置 Home作为主题的父级。

这样，当用户按下时，之前打开的活动将显示给用户。

Answer 2

在主题类的finish()点击内评论listitem。它会解决你的问题。

android活动堆栈 - 返回导航

2 个答案: