我想根据用户输入的参数在地图上画一个圆圈。
例如，如果用户输入1000范围的参数。接下来要做的是，当点击“Plot”按钮时，它将打开谷歌地图并在其上画一个圆圈。
我尝试用谷歌搜索相关的教程。不幸的是，所有人都在教授点击地图并自动绘制形状，其中半径已在源与地雷中定义。
以下是我的代码部分。
mapping.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:background="#607D8B">
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radius"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_span="1" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="numberDecimal"
android:gravity="center"/>
<requestFocus />
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/buttonBarButtonStyle"
android:text="Clear"
android:layout_margin="10dp"
android:background="#37474F"
android:layout_column="0" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/button1"
style="?android:attr/buttonBarButtonStyle"
android:text="Plot"
android:layout_margin="10dp"
android:background="#37474F"/>
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</TableRow>
</TableLayout>
这是我的java文件。
package com.epsilon.map;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class LossActivity extends Activity implements OnClickListener {
EditText radius = null;
Button plotButton = null;
Button clearButton = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mapping);
radius = (EditText)findViewById(R.id.editText1);
plotButton = (Button)findViewById(R.id.button2);
plotButton.setOnClickListener(this);
clearButton = (Button)findViewById(R.id.button1);
clearButton.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.loss, menu);
return true;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v == plotButton) {
double radius = Double.parseDouble(radius.getText().toString());
Intent intent = new Intent(this,MapActivity.class);
//something to write overhere
intent.putExtra("radius",radius);// playing with this
this.startActivity(intent);
}
else if(v == clearButton) {
((EditText)findViewById(R.id.editText1)).setText("");
}
}
}
最后是谷歌地图的地图活动，我认为问题是我对如何将上面的java文件与另一个java文件相关联的想法较少。
package com.epsilon.map;
import android.graphics.Color;
import android.location.Location;
import android.location.LocationListener;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.Circle;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapActivity extends FragmentActivity implements LocationListener{
GoogleMap googleMap;
Marker marker;
Circle shape;
private double radius;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
SupportMapFragment mfrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
googleMap = mfrag.getMap();
googleMap.setMyLocationEnabled(true);
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
@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_map, 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 onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
private void setMarker(String locality, String country, double lat,double lng){
LatLng LL = new LatLng(lat,lng);
MarkerOptions options = new MarkerOptions()
.title(locality)
.position(LL)
//.icon(BitmapDescriptor.fromResource(R.drawable.ic_mapmarker))
.icon(BitmapDescriptorFactory.defaultMarker());
marker = googleMap.addMarker(options);
shape = drawCircle(LL);
}
private Circle drawCircle(LatLng LL) {
CircleOptions options = new CircleOptions()
.center(LL)
.radius(radius)
.fillColor(0x330000FF)
.strokeColor(Color.BLUE)
.strokeWidth(3);
return googleMap.addCircle(options);
}
private void removeShape(){
marker.remove();
marker = null;
shape.remove();
shape = null;
}
}
答案 0 :(得分：1)
好的，你需要做的是这样的事情：
在LossActivity：
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v == plotButton) {
double radius = Double.parseDouble(radius.getText().toString());
Intent intent = new Intent(this, MapActivity.class);
//something to write overhere
Bundle b = new Bundle();
b.putDouble("radius", radius);
intent.putExtras(b);
this.startActivity(intent);
}
else if(v == clearButton) {
((EditText)findViewById(R.id.editText1)).setText("");
}
}
.....
然后在MapActivity：
private String provider;
private Location mCurrentLocation;
private LocationManager locationManager;
private double radius;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
Bundle b = getIntent().getExtras();
if (b != null) {
if (b.containsKey("radius")) {
radius = b.getDouble("radius");
}
}
SupportMapFragment mfrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
googleMap = mfrag.getMap();
googleMap.setMyLocationEnabled(true);
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
// Here starts the old code
//Criteria criteria = new Criteria();
//provider = locationManager.getBestProvider(criteria, false);
//locationManager.requestLocationUpdates(provider, 5000, 5, this);
//mCurrentLocation = locationManager.getLastKnownLocation(provider);
//if (mCurrentLocation != null) {
// onLocationChanged(mCurrentLocation);
//}
}
// Part of the new code
@Override
protected void onResume() {
super.onResume();
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
locationManager.requestLocationUpdates(provider, 500, 0, this);
}
@Override
public void onLocationChanged(Location location) {
setMarker("Locality", "Country", location.getLatitude(), location.getLongitude();
locationManager.removeUpdates(this);
}
此外，打开GPS以获得更高的准确度。