我正在Splash Screen中收集GPS位置数据并将其存储在会话中，稍后在MainActivity中使用它。如果GPS首次关闭或使用，它将在我的启动画面中请求许可。问题是我正在使用计时器将启动画面活动移动到另一个活动。由于计时器，SplashScreen将在未经许可的情况下移动到下一个活动。我希望我的Splash屏幕等到允许或拒绝权限对话框。以下是我的代码
import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Typeface;
import android.location.Address;
import android.location.Geocoder;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import zesteve.com.myapplication.location.LocationTrack;
import static android.Manifest.permission.ACCESS_COARSE_LOCATION;
import static android.Manifest.permission.ACCESS_FINE_LOCATION;
public class SplashActivity extends AppCompatActivity {
TextView welcomeText;
ImageView mLogo;
ImageView zbgimg;
Typeface tf1;
private Session session;
private ArrayList<String> permissionsToRequest;
private ArrayList<String> permissionsRejected = new ArrayList<>();
private ArrayList<String> permissions = new ArrayList<>();
private final static int ALL_PERMISSIONS_RESULT = 101;
LocationTrack locationTrack;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
session = new Session(SplashActivity.this);
//GPS Tracker
permissions.add(ACCESS_FINE_LOCATION);
permissions.add(ACCESS_COARSE_LOCATION);
permissionsToRequest = findUnAskedPermissions(permissions);
//get the permissions we have asked for before but are not granted..
//we will store this in a global list to access later.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (permissionsToRequest.size() > 0)
requestPermissions(permissionsToRequest.toArray(new String[permissionsToRequest.size()]), ALL_PERMISSIONS_RESULT);
}
locationTrack = new LocationTrack(SplashActivity.this);
if (locationTrack.canGetLocation()) {
double longitude = locationTrack.getLongitude();
double latitude = locationTrack.getLatitude();
Geocoder gcd = new Geocoder(SplashActivity.this, Locale.getDefault());
List<Address> addresses = null;
try {
addresses = gcd.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
if (addresses != null && addresses.size() > 0) {
String locality = addresses.get(0).getLocality();
String subLocality = addresses.get(0).getSubLocality();
String address = addresses.get(0).getAddressLine(0);
String state = addresses.get(0).getAdminArea();
String countryn = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String knownName = addresses.get(0).getFeatureName();
session.setLocation(latitude,longitude,locality,subLocality);
//Toast.makeText(SplashActivity.this,locality +" "+ postalCode + " " + latitude+ " " + longitude,Toast.LENGTH_SHORT).show();
}
} else {
locationTrack.showSettingsAlert();
}
welcomeText = (TextView) findViewById(R.id.welcome);
tf1 = Typeface.createFromAsset(getAssets(), "fonts/Roboto-Light.ttf");
welcomeText.setTypeface(tf1);
mLogo = (ImageView) findViewById(R.id.applogo);
zbgimg = (ImageView) findViewById(R.id.zbgimg);
zbgimg.setImageResource(R.drawable.splash_screen_option_three);
animation2();
animation3();
new Handler().postDelayed(new Runnable() {
@SuppressLint("PrivateResource")
@Override
public void run() {
if (session.FbLoggedIn()) {
Intent i = new Intent(SplashActivity.this,
MainActivity.class);
startActivity(i);
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
} else {
Intent i = new Intent(SplashActivity.this,
LoginActivity.class);
startActivity(i);
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
}
}
}, 3000);
}
private void animation2() {
mLogo.setAlpha(1.0F);
Animation anim = AnimationUtils.loadAnimation(SplashActivity.this, R.anim.translate_top_to_center);
mLogo.startAnimation(anim);
}
private void animation3() {
ObjectAnimator alphaAnimation = ObjectAnimator.ofFloat(welcomeText, "alpha", 0.0F, 1.0F);
alphaAnimation.setStartDelay(1700);
alphaAnimation.setDuration(500);
alphaAnimation.start();
}
///GPS Tracker
private ArrayList<String> findUnAskedPermissions(ArrayList<String> wanted) {
ArrayList<String> result = new ArrayList<String>();
for (String perm : wanted) {
if (!hasPermission(perm)) {
result.add(perm);
}
}
return result;
}
private boolean hasPermission(String permission) {
if (canMakeSmores()) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
return (checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED);
}
}
return true;
}
private boolean canMakeSmores() {
return (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1);
}
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case ALL_PERMISSIONS_RESULT:
for (String perms : permissionsToRequest) {
if (!hasPermission(perms)) {
permissionsRejected.add(perms);
}
}
if (permissionsRejected.size() > 0) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (shouldShowRequestPermissionRationale(permissionsRejected.get(0))) {
showMessageOKCancel("These permissions are mandatory for the application. Please allow access.",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(permissionsRejected.toArray(new String[permissionsRejected.size()]), ALL_PERMISSIONS_RESULT);
}
}
});
return;
}
}
}
break;
}
}
private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(SplashActivity.this)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", null)
.create()
.show();
}
@Override
protected void onDestroy() {
super.onDestroy();
locationTrack.stopListener();
}
如果您不明白，请发表评论。
答案 0 :(得分：1)
如果我理解正确，您需要在从启动画面跳转之前访问位置。如果是这样，只需删除计时器并打开启动画面，使其检查位置服务的开/关并获取位置，然后跳转到另一个活动。
if (!canGetLocation()) {
showSettingsAlert();
} else {
fetch location
if (session.FbLoggedIn()) {
startActivity(new Intent(SplashActivity.this, MainActivity.class));
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
} else {
startActivity(new Intent(SplashActivity.this, LoginActivity.class));
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
}
}
答案 1 :(得分：1)
尝试此解决方案。
首先，以这种方式制作onCreate()方法：
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
session = new Session(SplashActivity.this);
//GPS Tracker
permissions.add(ACCESS_FINE_LOCATION);
permissions.add(ACCESS_COARSE_LOCATION);
permissionsToRequest = findUnAskedPermissions(permissions);
//get the permissions we have asked for before but are not granted..
//we will store this in a global list to access later.
welcomeText = (TextView) findViewById(R.id.welcome);
tf1 = Typeface.createFromAsset(getAssets(), "fonts/Roboto-Light.ttf");
welcomeText.setTypeface(tf1);
mLogo = (ImageView) findViewById(R.id.applogo);
zbgimg = (ImageView) findViewById(R.id.zbgimg);
zbgimg.setImageResource(R.drawable.splash_screen_option_three);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (permissionsToRequest.size() > 0)
requestPermissions(permissionsToRequest.toArray(new String[permissionsToRequest.size()]), ALL_PERMISSIONS_RESULT);
}
else {
animation2();
animation3();
setUserLocation(); //After that start app
}
}
然后在onCreate（）之外创建单独的setUserLocation()函数，如下所示： -
public void setUserLocation() {
locationTrack = new LocationTrack(SplashActivity.this);
if (locationTrack.canGetLocation()) {
double longitude = locationTrack.getLongitude();
double latitude = locationTrack.getLatitude();
Geocoder gcd = new Geocoder(SplashActivity.this, Locale.getDefault());
List<Address> addresses = null;
try {
addresses = gcd.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
if (addresses != null && addresses.size() > 0) {
String locality = addresses.get(0).getLocality();
String subLocality = addresses.get(0).getSubLocality();
String address = addresses.get(0).getAddressLine(0);
String state = addresses.get(0).getAdminArea();
String countryn = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String knownName = addresses.get(0).getFeatureName();
session.setLocation(latitude,longitude,locality,subLocality);
//Toast.makeText(SplashActivity.this,locality +" "+ postalCode + " " + latitude+ " " + longitude,Toast.LENGTH_SHORT).show();
}
startApp();
} else {
locationTrack.showSettingsAlert();
}
}
onCreate（）之外还有一个单独的函数startApp()，如下所示： -
public void startApp() {
new Handler().postDelayed(new Runnable() {
@SuppressLint("PrivateResource")
@Override
public void run() {
if (session.FbLoggedIn()) {
Intent i = new Intent(SplashActivity.this,
MainActivity.class);
startActivity(i);
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
} else {
Intent i = new Intent(SplashActivity.this,
LoginActivity.class);
startActivity(i);
finish();
overridePendingTransition(R.anim.entry, R.anim.exit);
}
}
}, 3000);
}
最后，改变 onRequestPermissionsResult() 方法如下： -
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case ALL_PERMISSIONS_RESULT:
for (String perms : permissionsToRequest) {
if (!hasPermission(perms)) {
permissionsRejected.add(perms);
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (permissionsRejected.size() > 0) {
if (shouldShowRequestPermissionRationale(permissionsRejected.get(0))) {
showMessageOKCancel("These permissions are mandatory for the application. Please allow access.",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(permissionsRejected.toArray(new String[permissionsRejected.size()]), ALL_PERMISSIONS_RESULT);
}
}
});
return;
}
}
else {
animation2();
animation3();
setUserLocation(); //After that start app
}
}
else {
animation2();
animation3();
setUserLocation(); //After that start app
}
break;
}
}
因此，此解决方案首先遵循权限，然后是user-Location，然后是startApp。