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java - 更改屏幕方向时重置操作

转载 作者:太空宇宙 更新时间:2023-11-03 12:58:50 26 4
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我有一个带有一些 fragment 等的小应用程序。现在每次我改变屏幕的方向时, Action 都会重新开始,这意味着如果你转动你的设备,输入就会丢失。我怎样才能防止这种情况发生?此外,我想保留更改方向的可能性,应用程序也会随之更改,我只想保留内容。

魔术发生在 MainActivity.java 中,显示内容在 SearchFragment.xml 中

主要 Activity .java:

package mypackage;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import android.view.View;
import android.view.inputmethod.InputMethodManager;


public class MainActivity extends Activity {


public final static String EXTRA_MESSAGE = "mypackage.MESSAGE";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//addListenerOnSpinnerItemSelection();

// lädt die ActionBar
ActionBar actionbar = getActionBar();
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionbar.setDisplayShowHomeEnabled(true);
actionbar.setDisplayShowTitleEnabled(true);
actionbar.setDisplayShowCustomEnabled(false);

// lädt die Tabs in die Actionbar
String search = getString(R.string.search_fragment);
String user = getString(R.string.user_fragment);
String recent = getString(R.string.recent_fragment);

ActionBar.Tab TabA = actionbar.newTab().setText(search);
ActionBar.Tab TabB = actionbar.newTab().setText(user);
ActionBar.Tab TabC = actionbar.newTab().setText(recent);

// erstellt neue Fragmente
Fragment fragmentA = new SearchFragment();
Fragment fragmentB = new UserFragment();
Fragment fragmentC = new UpdateFragment();

// Listener werden angelegt
TabA.setTabListener(new MyTabsListener(fragmentA));
TabB.setTabListener(new MyTabsListener(fragmentB));
TabC.setTabListener(new MyTabsListener(fragmentC));

// Tabs werden in die actionbar geladen
actionbar.addTab(TabA);
actionbar.addTab(TabB);
actionbar.addTab(TabC);

}


public void sendMessage(View view)
{

Spinner mySpinner = (Spinner) findViewById(R.id.criterion);
String text = mySpinner.getSelectedItem().toString();

//manual initialation of array - later to be created by XML-Parser
String[][] array = {{"Opel", "Astra", "2010", "120 PS", "12 l/100km", "Blau, Rot, Grün, Braun", "File 1", "File 2"},
{"Opel", "Corsa", "2012", "80 PS", "8 l/100km", "Grün, Rot, Blau, Gelb, Magenta", "File 1", "File 2", "File 3"},
{"Opel","Vectra", "1980", "200 PS" ,"20 l/100km", "Braun", "file 1"},
{"Opel", "Astra", "2010", "120 PS", "12 l/100km", "Blau, Rot, Grün, Braun", "File 1", "File 2"},
{"Opel", "Corsa", "2012", "80 PS", "8 l/100km", "Grün, Rot, Blau, Gelb, Magenta", "File 1", "File 2", "File 3"},
{"Opel","Vectra", "1980", "200 PS" ,"20 l/100km", "Braun", "file 1"} };



// Intent intent = new Intent(this, DisplayMessageActivity.class);

EditText editText = (EditText) findViewById(R.id.edit_message);

String output = "";

//add Elements of Array on output string
for(int i = 0; i <array.length; i++)
{
int count = 0;

//Standard values
for(int j = 0; j<6; j++)
{
output = output + array[i][j];
if(count<5)
{
output = output + " - ";
}
count++;
}

output = output + "\n";

int count2 = 6;

//User generated values with diferent length
for(int k = 6; k <array[i].length; k++)
{
output = output + array[i][k];
if(count2<array[i].length-1)
{
output = output + " - ";
}
count2++;
}

output = output + "\n\n";
}


String message = getText(R.string.search_text)+" "+text+": "+ editText.getText().toString() + "\n\n"+output;

//display results
TextView viewText1 = (TextView) findViewById(R.id.showResults);
viewText1.setText(message);

//Clear EditText field
editText.setText("");

//Hides Softkeyboard on "Send" Button
InputMethodManager imm = (InputMethodManager)getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);

// intent.putExtra(EXTRA_MESSAGE, message);
// startActivity(intent);

}


class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;

public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// wenn das Tab erneut gewŠhlt wird.
}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(fragment);
}

}





@Override //creates the action bar menu using the text information from strings.xml and the method menu() from R.java
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_main, menu);
return true; //number of points in overflow menu or sth like this

}



public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.menu_settings:
{
Intent intent = new Intent(this, Settings.class);
startActivity(intent);
break;
}
case R.id.about_section:
{
Intent intent = new Intent(this, About.class);
startActivity(intent);
break;
}
case R.id.faq_section:
{
Intent intent = new Intent(this, FAQ.class);
startActivity(intent);
break;
}
case R.id.search_section:
{
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
break;
}
}

return true;
}
}

搜索 fragment .xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:orientation="vertical" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/welcome" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:orientation="horizontal" >

<EditText
android:id="@+id/edit_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:hint="@string/edit_message" />

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp" >

<Spinner
android:id="@+id/criterion"
android:layout_width="117dp"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:entries="@array/array"
android:prompt="@string/prompt" />

<Button
android:id="@+id/btnSubmit"
android:layout_width="136dp"
android:layout_marginRight="5dp"
android:layout_marginLeft="5dp"
android:layout_height="match_parent"
android:layout_gravity="clip_vertical"
android:onClick="sendMessage"
android:text="@string/button_send"
android:background="@drawable/android" />
</LinearLayout>

<TextView
android:id="@+id/showResults"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

最佳答案

据我所知,有一个用于此方向更改的监听器,因此您可以在方向更改之前保存一些数据,因为当方向更改 Activity 在内部重新启动时。

查看 http://developer.android.com/reference/android/view/OrientationListener.html

那是类(class)从那里看过去

希望对您有所帮助。

关于java - 更改屏幕方向时重置操作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14768542/

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