这是我的应用程序到目前为止： MapsActivity：
public class MapsActivity extends FragmentActivity implements GoogleMap.OnMarkerDragListener, OnMapReadyCallback, GoogleMap.OnMapLongClickListener, GoogleMap.OnMarkerClickListener, GoogleMap.OnMapLoadedCallback {
private GoogleMap mMap;
private HashMap<LatLng, CustomMarker> list;
public static String TAG = MapsActivity.class.getClass().getName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
list = new HashMap<>();
Log.e(TAG, "onCreate()");
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setOnMarkerClickListener(this);
mMap.setOnMapLoadedCallback(this);
mMap.setOnMapLongClickListener(this);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.setOnMarkerDragListener(this);
Log.e(TAG, "onMapReady");
}
@Override
public void onMapLoaded() {
retrieveMarkersFromDB();
Log.e(TAG, "onMapLoaded");
Toast.makeText(MapsActivity.this, "Touch and hold to create a marker", Toast.LENGTH_SHORT).show();
}
private void retrieveMarkersFromDB() {
new GetMarkers().execute();
}
@Override
public void onMapLongClick(LatLng latLng) {
mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
CustomMarker customMarker = getMarkerAddress(latLng);
addMarkerToList(customMarker,latLng);
Toast.makeText(MapsActivity.this, "Marker Added", Toast.LENGTH_SHORT).show();
}
private void addMarkerToList(CustomMarker customMarker, LatLng latLng) {
list.put(latLng, customMarker);
}
private CustomMarker getMarkerAddress(LatLng latLng) {
CustomMarker customMarker = null;
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
List<Address> allAddresses = geocoder.getFromLocation(latLng.latitude,latLng.longitude,2);
Address oneAddress = allAddresses.get(0);
try{
if(!oneAddress.getLocality().equals("null")||!oneAddress.getLocality().isEmpty()){
customMarker = new CustomMarker(oneAddress.getAddressLine(0)+", "+oneAddress.getLocality(),oneAddress.getCountryName(),"","");
}
}catch (NullPointerException e){
customMarker = new CustomMarker(oneAddress.getAddressLine(0),oneAddress.getCountryName(),"","");
}
} catch (IOException e) {
e.printStackTrace();
}catch (IndexOutOfBoundsException er){
customMarker = new CustomMarker("N/A","N/A","","");
}
return customMarker;
}
@Override
public boolean onMarkerClick(Marker marker) {
Intent intent = new Intent(this,com.example.fixxxer.mapapp.MarkerScreen.class);
CustomMarker customMarker = list.get(new LatLng(marker.getPosition().latitude,marker.getPosition().longitude));
intent.putExtra("addressLine",customMarker.getAddressLine());
intent.putExtra("countryName",customMarker.getCountryName());
intent.putExtra("imageURL",customMarker.getImageURL());
intent.putExtra("comment",customMarker.getComment());
intent.putExtra("lat",marker.getPosition().latitude);
intent.putExtra("lng",marker.getPosition().longitude);
startActivityForResult(intent,1);
return true;
}
@Override
protected void onDestroy() {
new DatabaseHelper(this,null,null,1).addMarkers(list);
super.onDestroy();
}
@Override
public void onMarkerDragStart(Marker marker) {
marker.remove();
list.remove(marker.getPosition());
Toast.makeText(MapsActivity.this, "Marker removed", Toast.LENGTH_SHORT).show();
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
}
public class GetMarkers extends AsyncTask<Void,Void,Void>{
@Override
protected Void doInBackground(Void... params) {
Log.e(TAG,"background task started");
list=new DatabaseHelper(MapsActivity.this,null,null,1).getallmarkers();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
Log.e("onPostExecute","background task ready");
Log.e(TAG,String.valueOf(list.size()));
if (!list.isEmpty()){
for (LatLng position: list.keySet() ) {
mMap.addMarker(new MarkerOptions().position(position).draggable(true));
}
}
super.onPostExecute(aVoid);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.e("Main", "onActivityResult()");
if (requestCode == 1) {
if (resultCode == MarkerScreen.RESULT_COMMENT_ONLY) {
String comment = data.getStringExtra("Comment");
String[]split = data.getStringExtra("Index").split(",");
list.get(new LatLng(Double.valueOf(split[0]),Double.valueOf(split[1]))).setComment(comment);
}else if (resultCode == MarkerScreen.RESULT_IMAGE_ONLY) {
String imageURI = data.getStringExtra("Image");
String[]split = data.getStringExtra("Index").split(",");
list.get(new LatLng(Double.valueOf(split[0]), Double.valueOf(split[1]))).setImageURL(imageURI);
} else if (resultCode == MarkerScreen.RESULT_BOTH) {
String comment = data.getStringExtra("Comment");
String imageURI = data.getStringExtra("Image");
String[]split = data.getStringExtra("Index").split(",");
list.get(new LatLng(Double.valueOf(split[0]), Double.valueOf(split[1]))).setComment(comment);
list.get(new LatLng(Double.valueOf(split[0]), Double.valueOf(split[1]))).setImageURL(imageURI);
} else {
Log.e("Main", "Result - no change");
}
}
}
标记屏幕类（活动）
public class MarkerScreen extends AppCompatActivity {
private static final int REQUEST_TAKE_PHOTO = 1;
private ImageView imageView;
private TextView addressView;
private TextView countryView;
private TextView latlngView;
private EditText commentView;
private Button saveButton;
private Button deleteButton;
private String addressFromIntent;
private String countryFromIntent;
private String commentFromIntent;
private double latFromIntent;
private double lngFromIntent;
private String photoPath;
private String newPhotoPath;
private int imageModified = 0;
private int commentModified = 0;
static final int RESULT_NONE = 0;
static final int RESULT_BOTH = 1;
static final int RESULT_COMMENT_ONLY = 2;
static final int RESULT_IMAGE_ONLY = 3;
static final int RESULT_DELETE=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_marker_screen);
//Initialising Views
addressView=(TextView)findViewById(R.id.textView);
countryView=(TextView)findViewById(R.id.textView2);
latlngView=(TextView)findViewById(R.id.textView3);
saveButton=(Button)findViewById(R.id.button);
saveButton.setText("Save");
imageView=(ImageView)findViewById(R.id.imageView);
commentView=(EditText)findViewById(R.id.editText);
//Getting intent information
addressFromIntent=getIntent().getStringExtra("addressLine");
countryFromIntent=getIntent().getStringExtra("countryName");
commentFromIntent=getIntent().getStringExtra("comment");
photoPath=getIntent().getStringExtra("imageURL");
latFromIntent=getIntent().getDoubleExtra("lat",0);
lngFromIntent=getIntent().getDoubleExtra("lng",0);
//Setting textFields
addressView.setText(addressFromIntent);
countryView.setText(countryFromIntent);
final String latlngTextField=String.valueOf(latFromIntent)+", "+String.valueOf(lngFromIntent);
latlngView.setText(latlngTextField);
if (photoPath.equals("")){
imageView.setImageResource(R.drawable.image);
} else {
imageView.setImageURI(Uri.parse(photoPath));
}
commentView.setText(commentFromIntent);
commentView.setHint("Enter comment here...");
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent();
Toast.makeText(MarkerScreen.this, photoPath, Toast.LENGTH_SHORT).show();
}
});
commentView.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
commentModified++;
}
});
saveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
if (imageModified == 0 && commentModified == 0) {
setResult(RESULT_NONE);
Log.e("MarkerActivity", "intentResult: RESULT_NONE");
finish();
} else if (imageModified > 0 && commentModified == 0) {
intent.putExtra("Image", newPhotoPath);
intent.putExtra("Index", latlngView.getText());
Log.e("MarkerActivity", "intentResult: RESULT_IMAGE ONLY");
setResult(RESULT_IMAGE_ONLY, intent);
finish();
} else if (imageModified == 0 && commentModified > 0) {
intent.putExtra("Comment", commentView.getText().toString());
intent.putExtra("Index", latlngView.getText());
setResult(RESULT_COMMENT_ONLY, intent);
Log.e("MarkerActivity", "intentResult: RESULT_COMMENT ONLY");
finish();
} else if (imageModified > 0 && commentModified > 0) {
intent.putExtra("Comment", commentView.getText().toString());
intent.putExtra("Image", newPhotoPath);
intent.putExtra("Index", latlngView.getText());
setResult(RESULT_BOTH, intent);
Log.e("MarkerActivity", "intentResult: RESULT_BOTH");
finish();
}
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
Log.e("markerActivity","back button pressed");
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override public void onBackPressed(){
this.finish();
Log.e("markerActivity"," hardware back button pressed");
}
private File createImageFile() throws IOException {
@SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES+ "/MapApp/" + addressFromIntent);
if (!storageDir.exists()){
File wallpaperDirectory = new File(storageDir.getPath());
boolean photoStatus =wallpaperDirectory.mkdirs();
}
File image = File.createTempFile(
imageFileName,
".jpg",
storageDir
);
newPhotoPath = "file:" + image.getAbsolutePath();
return image;
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
ex.printStackTrace();
}
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
Uri uri = Uri.parse(newPhotoPath);
imageView.setImageURI(uri);
imageModified++;
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putString("photopath",newPhotoPath);
outState.putString("comment",commentView.getText().toString());
outState.putString("addressView",addressView.getText().toString());
outState.putString("countryView",countryView.getText().toString());
outState.putString("latlngView",latlngView.getText().toString());
outState.putInt("imageModified", imageModified);
outState.putInt("commentModified", commentModified);
Log.e("Saved","saved info");
super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
photoPath=savedInstanceState.getString("photopath");
commentView.setText(savedInstanceState.getString("comment"));
addressView.setText(savedInstanceState.getString("addressView"));
countryView.setText(savedInstanceState.getString("countryView"));
latlngView.setText(savedInstanceState.getString("latlngView"));
imageModified=savedInstanceState.getInt("imageModified");
commentModified=savedInstanceState.getInt("commentModified");
Log.e("Restored","restored info");
}
activity_maps.xml
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.fixxxer.mapapp.MapsActivity">
<include layout="@layout/map_layout"/>
map_layout.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.fixxxer.mapapp.MapsActivity" />
我想用类似的Activity替换起始MarkerScreen Fragment。这该怎么做？我到目前为止尝试的是创建一个新的BlankFragment通过菜单，并在onMarkerClick()方法中设置：
getFragmentManager()
.beginTransaction()
.replace(R.id.layout.map_layout, BlankFragment.newInstance())
.addToBackStack(null) // enables back key
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) // if you need transition
.commit();
但我收到no view found错误。有一个简单的方法来做这一切吗？我非常喜欢碎片。
答案 0 :(得分：0)
在替换片段代码中使用R.id.map代替containerViewId，如下所示
getFragmentManager()
.beginTransaction()
.replace(R.id.map, BlankFragment.newInstance())
.addToBackStack(null) // enables back key
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) // if you need transition
.commit();