Java 将活动更改为类-Android
我对Java和Android有些陌生，我在类和活动方面遇到了麻烦。我正在清理我的代码，并将很多代码从MainActivity移动到不同的类，但我只能通过创建新的活动而不是类来让应用程序工作Java 将活动更改为类-Android,java,android,class,android-activity,Java,Android,Class,Android Activity,我对Java和Android有些陌生，我在类和活动方面遇到了麻烦。我正在清理我的代码，并将很多代码从MainActivity移动到不同的类，但我只能通过创建新的活动而不是类来让应用程序工作 我需要留在主视图中，只使用类的方法 从主活动a按钮，倒计时，然后调用LocationActivity LocationActivity查找GPS坐标，然后将其发送给SendActivity 这是我让它工作的唯一方法，因为我只需要启动locationListener，所以我只是在onCreate部分启动它
- 我需要留在主视图中，只使用类的方法
- 从主活动a按钮，倒计时，然后调用LocationActivity
- LocationActivity查找GPS坐标，然后将其发送给SendActivity
public class MainActivity extends Activity {
Button mCloseButton;
Button mOpenButton;
MultiDirectionSlidingDrawer mDrawer;
private Button send_button;
Button sendButton;
EditText msgTextField;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature( Window.FEATURE_NO_TITLE );
setContentView(R.layout.main);
send_button = (Button)findViewById(R.id.button2);
mDrawer.open();
mCloseButton.setOnClickListener( new OnClickListener() {
public void onClick( View v )
{
mDrawer.animateClose();
}
});
mOpenButton.setOnClickListener( new OnClickListener() {
public void onClick( View v )
{
if( !mDrawer.isOpened() )
mDrawer.animateOpen();
}
});
final SharedPreferences shared = getSharedPreferences("PEOPLE_PREFERENCES", MODE_PRIVATE);
final String first = shared.getString("FIRSTNAME", "");
final String last = shared.getString("LASTNAME", "0");
///////Profile Button////////////////
Button profile = (Button) findViewById(R.id.button1);
profile.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, PreferencesActivity.class));
}
});
///////////////////////////////////
//////Generate ID//////////////////
if (usr_id == null) {
char[] chars = "abcdefghijklmnopqrstuvwxyzABSDEFGHIJKLMNOPQRSTUVWXYZ1234567890".toCharArray();
Random r = new Random(System.currentTimeMillis());
char[] id = new char[8];
for (int i = 0; i < 8; i++) {
id[i] = chars[r.nextInt(chars.length)];
}
usr_id = new String(id);
Editor editor = shared.edit();
editor.putString("USR_ID", usr_id);
editor.commit();
}
//////////////////////////////////
////////Send Alert////////////////
///////Begin Timer///////////////
send_button.setOnClickListener(new OnClickListener() {
private boolean running = false;
private CountDownTimer timer;
public void onClick(View v) {
if(!running)
{
running = true;
timer = new CountDownTimer(4000, 1000) {
@Override
public void onFinish() {
send_button.setText("SENT");
startActivity(new Intent(MainActivity.this, LocationActivity.class));
SendUserActivity.sendId(usr_id1, first, last);
}
@Override
public void onTick(long sec) {
send_button.setText("CANCEL (" + sec / 1000 + ")");
}
}.start();
}
else
{
timer.cancel();
send_button.setText("Send!");
running = false;
}
}
});
}
///////////////////////////////////
@Override
public void onContentChanged()
{
super.onContentChanged();
mCloseButton = (Button) findViewById( R.id.button_open );
mOpenButton = (Button) findViewById( R.id.button_open );
mDrawer = (MultiDirectionSlidingDrawer) findViewById( R.id.drawer );
}
}
package com.alex.www;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
public class LocationActivity extends Activity {
private LocationManager locManager;
private LocationListener locListener;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startLocation();
}
void startLocation()
{
SharedPreferences shared = getSharedPreferences("PEOPLE_PREFERENCES", MODE_PRIVATE);
final String usr_id2 = shared.getString("USR_ID", "none");
//get a reference to the LocationManager
locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//checked to receive updates from the position
locListener = new LocationListener() {
public void onLocationChanged(Location location) {
SendActivity.send(location, usr_id2);
}
public void onProviderDisabled(String provider){
//labelState.setText("Provider OFF");
}
public void onProviderEnabled(String provider){
//labelState.setText("Provider ON ");
}
public void onStatusChanged(String provider, int status, Bundle extras){
Log.i("", "Provider Status: " + status);
}
};
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locListener);
}
}
package com.alex.www;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.content.SharedPreferences;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class SendActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static void send(Location loc, String usr_id2)
{
Log.i("", String.valueOf(loc.getLatitude() + " - " + String.valueOf(loc.getLongitude())));
String lat = String.valueOf(loc.getLatitude());
String lon = String.valueOf(loc.getLongitude());
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://example.com/test/example.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("lat", lat));
nameValuePairs.add(new BasicNameValuePair("lon", lon));
nameValuePairs.add(new BasicNameValuePair("id", usr_id2));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
}
catch (ClientProtocolException e) {
// TODO Auto-generated catch block
}
catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
public class MainActivity extends Activity {
Button mCloseButton;
Button mOpenButton;
MultiDirectionSlidingDrawer mDrawer;
private Button send_button;
Button sendButton;
EditText msgTextField;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature( Window.FEATURE_NO_TITLE );
setContentView(R.layout.main);
send_button = (Button)findViewById(R.id.button2);
mDrawer.open();
mCloseButton.setOnClickListener( new OnClickListener() {
public void onClick( View v )
{
mDrawer.animateClose();
}
});
mOpenButton.setOnClickListener( new OnClickListener() {
public void onClick( View v )
{
if( !mDrawer.isOpened() )
mDrawer.animateOpen();
}
});
final SharedPreferences shared = getSharedPreferences("PEOPLE_PREFERENCES", MODE_PRIVATE);
final String first = shared.getString("FIRSTNAME", "");
final String last = shared.getString("LASTNAME", "0");
///////Profile Button////////////////
Button profile = (Button) findViewById(R.id.button1);
profile.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, PreferencesActivity.class));
}
});
///////////////////////////////////
//////Generate ID//////////////////
if (usr_id == null) {
char[] chars = "abcdefghijklmnopqrstuvwxyzABSDEFGHIJKLMNOPQRSTUVWXYZ1234567890".toCharArray();
Random r = new Random(System.currentTimeMillis());
char[] id = new char[8];
for (int i = 0; i < 8; i++) {
id[i] = chars[r.nextInt(chars.length)];
}
usr_id = new String(id);
Editor editor = shared.edit();
editor.putString("USR_ID", usr_id);
editor.commit();
}
//////////////////////////////////
////////Send Alert////////////////
///////Begin Timer///////////////
send_button.setOnClickListener(new OnClickListener() {
private boolean running = false;
private CountDownTimer timer;
public void onClick(View v) {
if(!running)
{
running = true;
timer = new CountDownTimer(4000, 1000) {
@Override
public void onFinish() {
send_button.setText("SENT");
startActivity(new Intent(MainActivity.this, LocationActivity.class));
SendUserActivity.sendId(usr_id1, first, last);
}
@Override
public void onTick(long sec) {
send_button.setText("CANCEL (" + sec / 1000 + ")");
}
}.start();
}
else
{
timer.cancel();
send_button.setText("Send!");
running = false;
}
}
});
}
///////////////////////////////////
@Override
public void onContentChanged()
{
super.onContentChanged();
mCloseButton = (Button) findViewById( R.id.button_open );
mOpenButton = (Button) findViewById( R.id.button_open );
mDrawer = (MultiDirectionSlidingDrawer) findViewById( R.id.drawer );
}
}
package com.alex.www;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
public class LocationActivity extends Activity {
private LocationManager locManager;
private LocationListener locListener;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startLocation();
}
void startLocation()
{
SharedPreferences shared = getSharedPreferences("PEOPLE_PREFERENCES", MODE_PRIVATE);
final String usr_id2 = shared.getString("USR_ID", "none");
//get a reference to the LocationManager
locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//checked to receive updates from the position
locListener = new LocationListener() {
public void onLocationChanged(Location location) {
SendActivity.send(location, usr_id2);
}
public void onProviderDisabled(String provider){
//labelState.setText("Provider OFF");
}
public void onProviderEnabled(String provider){
//labelState.setText("Provider ON ");
}
public void onStatusChanged(String provider, int status, Bundle extras){
Log.i("", "Provider Status: " + status);
}
};
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locListener);
}
}
package com.alex.www;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.content.SharedPreferences;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class SendActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static void send(Location loc, String usr_id2)
{
Log.i("", String.valueOf(loc.getLatitude() + " - " + String.valueOf(loc.getLongitude())));
String lat = String.valueOf(loc.getLatitude());
String lon = String.valueOf(loc.getLongitude());
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://example.com/test/example.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("lat", lat));
nameValuePairs.add(new BasicNameValuePair("lon", lon));
nameValuePairs.add(new BasicNameValuePair("id", usr_id2));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
}
catch (ClientProtocolException e) {
// TODO Auto-generated catch block
}
catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
package.com.alex.www；
导入java.io.IOException；
导入java.util.ArrayList；
导入java.util.List；
导入org.apache.http.NameValuePair；
导入org.apache.http.client.ClientProtocolException；
导入org.apache.http.client.HttpClient；
导入org.apache.http.client.entity.UrlEncodedFormEntity；
导入org.apache.http.client.methods.HttpPost；
导入org.apache.http.impl.client.DefaultHttpClient；
导入org.apache.http.message.BasicNameValuePair；
导入android.app.Activity；
导入android.content.SharedReferences；
导入android.location.location；
导入android.os.Bundle；
导入android.util.Log；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.TextView；
公共类SendActivity扩展了活动{
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
}
公共静态无效发送（位置loc，字符串usr_id2）
{
Log.i（“”，String.valueOf（loc.getLatitude（）+“-”+String.valueOf（loc.getLatitude（）））；
String lat=String.valueOf（loc.getLatitude（））；
String lon=String.valueOf（loc.getLongitude（））；
HttpClient HttpClient=新的DefaultHttpClient（）；
HttpPost HttpPost=新的HttpPost（“http://example.com/test/example.php");
试一试{
List nameValuePairs=新的ArrayList（2）；
添加（新的BasicNameValuePair（“lat”，lat））；
添加（新的BasicNameValuePair（“lon”，lon））；
添加（新的BasicNameValuePair（“id”，usr_id2））；
setEntity（新的UrlEncodedFormEntity（nameValuePairs））；
httpclient.execute（httppost）；
}
捕获（客户端协议例外e）{
//TODO自动生成的捕捉块
}
捕获（IOE异常）{
//TODO自动生成的捕捉块
}
}
}
如果您使用1视图1活动原则，android操作系统将非常支持您。例如，将支持按顺序向后遍历后退按钮 一般做法是： 使它们成为类（移除扩展活动）并为接受上下文作为参数的两个类生成构造函数。准备好你们的方法，在主活动中创建这个类的新实例，这样你们就可以使用它的方法了。也许你需要适应一些东西，但这应该不是什么大问题
顺便说一句：建议使用管理所有长操作（如位置更新、http发送/接收），这样您的UI不会被冻结，您可以避免强制关闭。活动是一个类。他说，如果您需要执行任何使用外部服务的操作，或者执行一些可能很长的操作，那么最好使用AsyncTask在自己的线程上执行。请详细了解恕我直言，先学习Java，而不必同时学习Android。我相信你不会感激这条建议，但一旦你对Java有了深入的了解，你就会明白这是你最好的行动方式。你能给我一个代码示例吗？只是为了让我开始。如果我从LocationActivity中删除extends活动部分，
getSystemService