我很难找到答案，因为涉及很多因素。我制作了一个简单的搜索引擎应用程序，它使用微调器为搜索选择过滤选项，例如：您可以选择要搜索的图像的颜色或大小。我在他们的API（JSON格式）中使用Google搜索API和搜索参数。这是开发人员链接（显示我必须使用的参数名称）：https://developers.google.com/imagesearch/v1/jsondevguide#request_format
问题：该应用运行正常，除非您选择过滤器选项，例如红色...它实际上返回错误的过滤器，它返回蓝色。我查看了我的switch语句，在那里我按案例编号排序API参数，它们匹配我的strings.xml中的XML布局（不确定字符串顺序是否重要），以及在运行时匹配实际的下拉列表微调器顺序应用程序。我也使用getSelectedItemPosition()方法，我假设它会选择实际的过滤器，但我必须遗漏一些东西。
尽管这个项目非常复杂，但我得到了很多代码的帮助，所以我不确定它到底意味着什么（或者确实如此）......我还在学习和初学者。< / p>
我将发布我的两个主要活动，但如果你需要更多（比如我的XML），请告诉我。这两项活动很长，所以如果我不需要，也不想发帖太多。非常感谢你提前！
我的主要活动包含一个EditText字段，一个搜索按钮和一个高级搜索按钮（导致活动＃2低于此一个）。
package com.noni.gridimagesearch;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.JsonHttpResponseHandler;
public class SearchActivity extends Activity {
EditText etQuery;
GridView gvResults;
Button btnSearch;
Button advancedSearch;
String filterPreferences;
private String FilterPreferences;
ArrayList<ImageResult> imageResults = new ArrayList<ImageResult>();
ImageResultArrayAdapter imageAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
setupViews();
//This enables you to click on an image, and see it in its own activity
imageAdapter = new ImageResultArrayAdapter(this, imageResults);
gvResults.setAdapter(imageAdapter);
gvResults.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapter, View parent,
int position, long rowId) {
Intent i = new Intent(getApplicationContext(),
ImageDisplayActivity.class);
ImageResult imageResult = imageResults.get(position);
i.putExtra("result", imageResult);
startActivity(i);
}
});
// //Attempt at the endless scroll feature
// GridView gvResults = (GridView) findViewById(R.id.gvResults);
// gvResults.setOnScrollListener(new EndlessScrollListener() {
// @Override
// public void onLoadMore(int page, int totalItemsCount) {
// loadMoreImages(totalItemsCount);
// }
// });
//
// public void loadMoreImages(int totalItemsCount) {
// String query = etQuery.getText().toString();
// AsyncHttpClient client = new AsyncHttpClient();
// makeAsyncHttpGetRequest(client, totalItemsCount, query);
// }
//Create intent to go from Advanced Search button to Advanced Search Activity
Button advancedSearch = (Button) findViewById(R.id.advancedSearch);
advancedSearch.setOnClickListener(new OnClickListener() {
public void onClick(View v){
Intent i = new Intent (SearchActivity.this, AdvancedOptionsActivity.class);
startActivity(i);
}
});
}//end onCreate method
public void setupViews() {
etQuery = (EditText) findViewById(R.id.etQuery);
gvResults = (GridView) findViewById(R.id.gvResults);
btnSearch = (Button) findViewById(R.id.btnSearch);
}
//Using onClick method from btnSearch in layout, called onImageSearch
public void onImageSearch(View v) {
String query = etQuery.getText().toString();
Toast.makeText(this, "Searching for " + query, Toast.LENGTH_SHORT).show();
//Then makes the HTTP request from the Google API
AsyncHttpClient client = new AsyncHttpClient();
imageResults.clear();
int offset = 0;
FilterPreferences = getFilterPreferences();
client.get("https://ajax.googleapis.com/ajax/services/search/images?rsz=8&" +
FilterPreferences + "start=" + offset + "&v=1.0&q=" + Uri.encode(query),
new JsonHttpResponseHandler() { //A handler is set in case the search doesn't work
@Override
public void onSuccess(JSONObject response) {
JSONArray imageJsonResults = null;
try {
imageJsonResults = response.getJSONObject("responseData")
.getJSONArray("results");
imageAdapter.addAll(ImageResult
.fromJSONArray(imageJsonResults));
Log.d("DEBUG", imageResults.toString());
} catch (JSONException e) {
e.printStackTrace();
}
} //End onSuccess
}); //End client.get()
} //End onImageSearch
//Spells out all my filter preferences by using the API "language" put into variables
//and ultimately becomes a part of the getFilterPreferences method
public String getFilterPreferences() {
String filterPreferences, imageType, imageSize, colorFilter = null;
SharedPreferences filters = getSharedPreferences(AdvancedOptionsActivity.FILTERS, 0);
switch(filters.getInt("image_type", 0)) {
case 0: imageType = ""; break;
case 1: imageType = "&imgtype=face"; break;
case 2: imageType = "&imgtype=photo"; break;
case 3: imageType = "&imgtype=lineart"; break;
case 4: imageType = "&imgtype=clipart"; break;
default: imageType = "";
}
switch(filters.getInt("color_filter", 0)) {
case 0: colorFilter = ""; break;
case 1: colorFilter = "&imgcolor=blue"; break;
case 2: colorFilter = "&imgcolor=red"; break;
case 3: colorFilter = "&imgcolor=green"; break;
case 4: colorFilter = "&imgcolor=orange"; break;
case 5: colorFilter = "&imgcolor=gray"; break;
default: colorFilter = "";
}
switch(filters.getInt("image_size", 0)) {
case 0: imageSize = ""; break;
case 1: imageSize = "&imgsz=small"; break;
case 2: imageSize = "&imgsz=medium"; break;
case 3: imageSize = "&imgsz=large"; break;
case 4: imageSize = "&imgsz=xlarge"; break;
default: imageSize = "";
}
filterPreferences = imageType + colorFilter + imageSize;
//If selects nothing, it will still run the filterPreferences variable
//to include the default selections (filters shown in top row of spinner)
if (filterPreferences.equals("")) return filterPreferences;
else return filterPreferences + "&";
}// End getFilterPreferences
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.search, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我的第二个活动，包含所有微调器和过滤器选项：
package com.noni.gridimagesearch;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
public class AdvancedOptionsActivity extends Activity {
private Spinner colorFilter, imageSize, imageType;
protected static final String FILTERS = "FilterPreferences";
private Button btnSubmit;
private ArrayAdapter<CharSequence> imageSizeAdapter, colorFilterAdapter, imageTypeAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_advanced_options);
setupViews();
restoreFilterPreferences();
}
private void setupViews() {
imageType = (Spinner) findViewById(R.id.image_type);
imageTypeAdapter = ArrayAdapter.createFromResource(this,
R.array.image_type, android.R.layout.simple_spinner_item);
imageTypeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
imageType.setAdapter(imageTypeAdapter);
colorFilter = (Spinner) findViewById(R.id.color_filter);
colorFilterAdapter = ArrayAdapter.createFromResource(this,
R.array.color_filter, android.R.layout.simple_spinner_item);
colorFilterAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
colorFilter.setAdapter(colorFilterAdapter);
imageSize = (Spinner) findViewById(R.id.image_size);
imageSizeAdapter = ArrayAdapter.createFromResource(this,
R.array.image_size, android.R.layout.simple_spinner_item);
imageSizeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
imageSize.setAdapter(imageSizeAdapter);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent();
setResult(RESULT_OK, i);
finish();
}
});
}
private void restoreFilterPreferences() {
SharedPreferences filters = getSharedPreferences(FILTERS, 0);
int imageSizeSelection = filters.getInt("image_size", 0);
imageSize.setSelection(imageSizeSelection);
int colorFilterSelection = filters.getInt("color_filter", 0);
colorFilter.setSelection(colorFilterSelection);
int imageTypeSelection = filters.getInt("image_type", 0);
imageType.setSelection(imageTypeSelection);
}
@Override
protected void onPause() {
super.onPause();
saveFilterPreferences();
}
private void saveFilterPreferences() {
SharedPreferences filters = getSharedPreferences(FILTERS, 0);
SharedPreferences.Editor editor = filters.edit();
editor.putInt("image_size", imageSize.getSelectedItemPosition());
editor.putInt("color_filter", colorFilter.getSelectedItemPosition());
editor.putInt("image_type", imageType.getSelectedItemPosition());
editor.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.advanced_options, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：0)
我看到现在发生了什么，毕竟是一个简单的错误。第一个Activity中colorFilter变量的case语句有第一行读取空字符串case 0: imageType = ""; break;但是在我的微调器中，我没有在下拉列表的顶部创建一个字符串允许这个空字符串，所以我的所有颜色都在列表中向下移动了一个。所以列表中的第一种颜色，蓝色，实际上采用了列表中的最后一种颜色，灰色，因为它从最后一个位置突然出现。
无论如何，这么多代码如此困在这么简单的错误上，但很高兴我发现了它。这些错误确实是最难的，因为它们永远不会在LogCat中找到，也不是红色错误。