为什么图像需要这么长时间才能在此应用中加载？

时间：2015-12-27 05:33:02

标签： java android google-places-api google-places

我刚开始使用Google Places API制作应用。到目前为止，该应用程序允许用户选择一个地方，然后它显示该地点的图像。但是，图像需要几分钟才能加载，有时根本不加载。如果您看到错误，请告诉我。

MainActivity.java 

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Html;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import   com.google.android.gms.common.GooglePlayServicesNotAvailableException;
import com.google.android.gms.common.GooglePlayServicesRepairableException;
import com.google.android.gms.location.places.Place;
import com.google.android.gms.location.places.ui.PlacePicker;


import java.util.concurrent.ExecutionException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity {

private int PLACE_PICKER_REQUEST = 1;
private TextView tvName;
private TextView tvAddress;
private TextView tvAttributions;
private TextView price;
private TextView phone;
private TextView rating;
TextView id;
ImageView downloadedImg;
CharSequence placeID;
String photoReference;


public void logStuff (){
     //
          ImageDownloader task = new ImageDownloader();
     Bitmap myImage;
     try {
         myImage = task.execute("https://maps.googleapis.com/maps/api/place/photo?maxwidth=500&maxheight=500&photoreference=" + photoReference + "&key=APIKEY").get();
        downloadedImg.setImageBitmap(myImage);
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }


    Log.i("button", "tapped");
    Log.i("imageurl", (String) placeID);
}





@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tvName = (TextView) findViewById(R.id.name);
    tvAddress = (TextView) findViewById(R.id.address);
    tvAttributions = (TextView) findViewById(R.id.attributions);
    price = (TextView) findViewById(R.id.price);
    phone = (TextView) findViewById(R.id.phone);
    rating = (TextView) findViewById(R.id.rating);
    id = (TextView) findViewById(R.id.placeId);
    downloadedImg = (ImageView) findViewById(R.id.imageView);

    Toolbar toolBar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolBar);






}

public void onPickButtonClick(View v) {
    // Construct an intent for the place picker
    try {
        PlacePicker.IntentBuilder intentBuilder =
                new PlacePicker.IntentBuilder();
        Intent intent = intentBuilder.build(this);
        // Start the intent by requesting a result,
        // identified by a request code.
        startActivityForResult(intent, PLACE_PICKER_REQUEST);

    } catch (GooglePlayServicesRepairableException e) {
        e.printStackTrace();
    } catch (GooglePlayServicesNotAvailableException e) {
        e.printStackTrace();
    }
}

@Override
protected void onActivityResult(int requestCode,
                                int resultCode, Intent data) {


    if (requestCode == PLACE_PICKER_REQUEST
            && resultCode == Activity.RESULT_OK) {

        // The user has selected a place. Extract the name and address.
        final Place place = PlacePicker.getPlace(data, this);

        final CharSequence name = place.getName();
        final CharSequence address = place.getAddress();
        final int priceLevel = place.getPriceLevel();
        final CharSequence phoneNum = place.getPhoneNumber();
        final float rate = place.getRating();
        placeID = place.getId();
        logStuff();

        DownloadTask task = new DownloadTask();
        String result = null;


        try {

            result = task.execute("https://maps.googleapis.com/maps/api/place/details/json?placeid=" + placeID + "&key=APIKEY").get();
            Pattern p = Pattern.compile("photo_reference\" : \"(.*?)\"");
            Matcher m = p.matcher(result);
            while (m.find()) {
         photoReference =  m.group(1);
                Log.i("PLACE", photoReference);

            }

        } catch (InterruptedException e) {

            e.printStackTrace();

        } catch (ExecutionException e) {

            e.printStackTrace();

        }

        Log.i("Contents Of URL", result);



        String attributions = PlacePicker.getAttributions(data);
        if (attributions == null) {
            attributions = "";
        }
        tvName.setText(name);
        tvAddress.setText(address);



    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}
}

ImageDownloader.java 

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class ImageDownloader extends AsyncTask<String, Void, Bitmap>  {


@Override
protected Bitmap doInBackground(String... urls) {

    try {
        URL url = new URL(urls[0]);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.connect();
        InputStream inputStream = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(inputStream);
        return myBitmap;


    } catch (MalformedURLException e) {

        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}
}

DownloadTask.java 

import android.os.AsyncTask;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


public class DownloadTask extends AsyncTask<String, Void, String> {

@Override
protected String doInBackground(String... urls) {

    String result = "";
    URL url;
    HttpURLConnection urlConnection = null;

    try {

        url = new URL(urls[0]);

        urlConnection = (HttpURLConnection)url.openConnection();

        InputStream in = urlConnection.getInputStream();

        InputStreamReader reader = new InputStreamReader(in);

        int data = reader.read();

        while (data != -1) {

            char current = (char) data;

            result += current;

            data = reader.read();

        }

        return result;

    }
    catch(Exception e) {

        e.printStackTrace();

        return "Failed";

    }


}

activity_main.xml中

 <RelativeLayout 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"
tools:context=".PlacePickerActivity">

<!--including the toobar-->
<include layout="@layout/toolbar" />

<TextView
    android:id="@+id/name"
    android:gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/attributions"
    android:layout_alignEnd="@+id/attributions"
    android:layout_below="@+id/toolbar"
    android:layout_margin="10dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/address"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_below="@+id/name"
    android:layout_margin="10dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/attributions"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentRight="true"
    android:text="attributions"/>

<Button
    android:layout_width="350dp"
    android:layout_height="75dp"
    android:onClick="onPickButtonClick"
    android:text="Find a location"
    android:id="@+id/button"
    android:textSize="30dp"
    android:background="#ebb70d"
    android:layout_above="@+id/attributions"
    android:layout_centerHorizontal="true" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Rating:"
    android:id="@+id/rating"
    android:layout_alignBaseline="@+id/phone"
    android:layout_alignBottom="@+id/phone"
    android:layout_alignStart="@+id/phone" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Phone"
    android:id="@+id/phone"
    android:layout_below="@+id/address"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="94dp" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Price"
    android:id="@+id/price"
    android:layout_below="@+id/phone"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="74dp" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="place Id"
    android:id="@+id/placeId"
    android:layout_below="@+id/price"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="46dp" />

<ImageView
    android:layout_width="500dp"
    android:layout_height="500dp"
    android:id="@+id/imageView"
    android:layout_above="@+id/rating"
    android:layout_alignTop="@+id/name"
    android:layout_alignStart="@+id/button"
    android:layout_alignEnd="@+id/button"
    android:maxHeight="500dp"
    android:maxWidth="500dp" />


</RelativeLayout>

注意：如果您想测试此项，则需要输入自己的api密钥

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