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带内容的文本数据+带内容的图像URL=工作

空文本数据+空图像URL=应用程序崩溃

空文本数据+带内容的图像URL=有效

textdata with content+empty image urls=应用程序崩溃

这是获取和发送(到RecyclerviewAdapter(代码：

public void JSON_DATA_WEB_CALL (String url){
jsonArrayRequest = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {

JSON_PARSE_DATA_AFTER_WEBCALL(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
public void JSON_PARSE_DATA_AFTER_WEBCALL(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
GetDataAdapter GetDataAdapter2 = new GetDataAdapter();
JSONObject json = null;
try {

json = array.getJSONObject(i);

GetDataAdapter2.setImageUrl(json.getString(Image_URL_JSON));
GetDataAdapter2.setImageUrl2(json.getString(Image_URL_JSON2));
GetDataAdapter2.setImageUrl3(json.getString(Image_URL_JSON3));
GetDataAdapter2.setImageUrl4(json.getString(Image_URL_JSON4));
GetDataAdapter2.setImageUrl5(json.getString(Image_URL_JSON5));
GetDataAdapter2.setPhone_number(json.getString(SOMETEXT));
GetDataAdapter2.setName(json.getString(SOMETEXT2));
GetDataAdapter2.setSubject2(json.getString(SOMETEXT3));
} catch (JSONException e) {
e.printStackTrace();
}
GetDataAdapter1.add(GetDataAdapter2);
}
recyclerViewadapter = new RecyclerViewAdapter(solutionTemplate.this, GetDataAdapter1, exerciseAdapter);
recyclerView.setAdapter(recyclerViewadapter);
}

主要问题是：

json = array.getJSONObject(i);
GetDataAdapter2.setImageUrl(json.getString(Image_URL_JSON));
GetDataAdapter2.setImageUrl2(json.getString(Image_URL_JSON2));
GetDataAdapter2.setImageUrl3(json.getString(Image_URL_JSON3));
GetDataAdapter2.setImageUrl4(json.getString(Image_URL_JSON4));
GetDataAdapter2.setImageUrl5(json.getString(Image_URL_JSON5));
GetDataAdapter2.setPhone_number(json.getString(SOMETEXT));
GetDataAdapter2.setName(json.getString(SOMETEXT2));
GetDataAdapter2.setSubject2(json.getString(SOMETEXT3));

工作：

json = array.getJSONObject(i);
GetDataAdapter2.setImageUrl(json.getString(Image_URL_JSON));
GetDataAdapter2.setImageUrl2(json.getString(Image_URL_JSON2));
GetDataAdapter2.setImageUrl3(json.getString(Image_URL_JSON3));
GetDataAdapter2.setImageUrl4(json.getString(Image_URL_JSON4));
GetDataAdapter2.setImageUrl5(json.getString(Image_URL_JSON5));

不工作：

GetDataAdapter2.setPhone_number(json.getString(SOMETEXT));
GetDataAdapter2.setName(json.getString(SOMETEXT2));
GetDataAdapter2.setSubject2(json.getString(SOMETEXT3));

获取带有内容的图像URL是必要的

但没有它应该可以工作！

这是GetDataAdapter：

public String getPhone_number() {
return phone_number;
}
public void setPhone_number(String phone_number1) {
this.phone_number = phone_number1;
}
public String getSubject2() {
return subject2;
}
public void setSubject2(String subject2) {
this.subject2 = subject2;
}
public String getImageUrl() {
return ImageURL;
}
public void setImageUrl(String imageServerUrl) {
this.ImageURL = imageServerUrl;
}

public String getImageUrl2() {
return ImageURL2;
}
public void setImageUrl2(String imageServerUrl2) {
this.ImageURL2 = imageServerUrl2;
}

public String getImageUrl3() {
return ImageURL3;
}
public void setImageUrl3(String imageServerUrl3) {
this.ImageURL3 = imageServerUrl3;
}

public String getImageUrl4() {
return ImageURL4;
}
public void setImageUrl4(String imageServerUrl4) {
this.ImageURL4 = imageServerUrl4;
}

public String getImageUrl5() {
return ImageURL5;
}
public void setImageUrl5(String imageServerUrl5) {
this.ImageURL5 = imageServerUrl5;
}

RecyclerViewAdapter：

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
if (holder instanceof ViewHolder) {
final GetDataAdapter current = getItem(position - 1);
final ViewHolder holder1 = (ViewHolder) holder;
final ImageLoader imageLoader = ImageAdapter.getInstance(context).getImageLoader();
final ImageLoader imageLoader2 = ImageAdapter.getInstance(context).getImageLoader();
final ImageLoader imageLoader3 = ImageAdapter.getInstance(context).getImageLoader();
final ImageLoader imageLoader4 = ImageAdapter.getInstance(context).getImageLoader();
final ImageLoader imageLoader5 = ImageAdapter.getInstance(context).getImageLoader();
imageLoader.get(current.getImageUrl(),
ImageLoader.getImageListener(
holder1.imageView1,
R.mipmap.ic_launcher_image,
android.R.drawable.ic_dialog_alert
)
);
imageLoader2.get(current.getImageUrl2(),
ImageLoader.getImageListener(
holder1.imageView2,
R.mipmap.ic_launcher_image,
android.R.drawable.ic_dialog_alert
)
);
imageLoader3.get(current.getImageUrl3(),
ImageLoader.getImageListener(
holder1.imageView3,
R.mipmap.ic_launcher_image,
android.R.drawable.ic_dialog_alert
)
);
imageLoader4.get(current.getImageUrl4(),
ImageLoader.getImageListener(
holder1.imageView4,
R.mipmap.ic_launcher_image,
android.R.drawable.ic_dialog_alert
)
);
imageLoader5.get(current.getImageUrl5(),
ImageLoader.getImageListener(
holder1.imageView5,
R.mipmap.ic_launcher_image,
android.R.drawable.ic_dialog_alert
)
);

holder1.imageView1.setImageUrl(current.getImageUrl(), imageLoader);
holder1.imageView2.setImageUrl(current.getImageUrl2(), imageLoader2);
holder1.imageView3.setImageUrl(current.getImageUrl3(), imageLoader3);
holder1.imageView4.setImageUrl(current.getImageUrl4(), imageLoader4);
holder1.imageView5.setImageUrl(current.getImageUrl5(), imageLoader5);
holder1.NameTextView.setText(current.getName());
holder1.PhoneNumberTextView.setText(current.getPhone_number());
holder1.SubjectTextView.setText(current.getSubject2());

ImageAdapter：

public class ImageAdapter {
public static ImageAdapter imageAdapter;
public Network networkOBJ ;
public RequestQueue requestQueue1;
public ImageLoader Imageloader1;
public Cache cache1 ;
public static Context context1;
LruCache<String, Bitmap> LRUCACHE = new LruCache<String, Bitmap>(30);
private ImageAdapter(Context context) {
this.context1 = context;
this.requestQueue1 = RequestQueueFunction();
Imageloader1 = new ImageLoader(requestQueue1, new ImageLoader.ImageCache() {
@Override
public Bitmap getBitmap(String URL) {
return LRUCACHE.get(URL);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
LRUCACHE.put(url, bitmap);
}
});
}
public ImageLoader getImageLoader() {
return Imageloader1;
}
public static ImageAdapter getInstance(Context SynchronizedContext) {
if (imageAdapter == null) {
imageAdapter = new ImageAdapter(SynchronizedContext);
}
return imageAdapter;
}
public RequestQueue RequestQueueFunction() {
if (requestQueue1 == null) {
cache1 = new DiskBasedCache(context1.getCacheDir());
networkOBJ = new BasicNetwork(new HurlStack());
requestQueue1 = new RequestQueue(cache1, networkOBJ);
requestQueue1.start();
}
return requestQueue1;
}

}

PHP：

<?php


$conn = mysqli_connect('localhost', 'root', '','webapp');
$id = $_GET['id'];

$sql = "SELECT * FROM answers WHERE id='$id' ORDER BY id DESC";
$res = mysqli_query($conn,$sql);
$result = array();

while($row = mysqli_fetch_array($res)){
array_push($result,array(
'url2'=>$row['images'],
'url3'=>$row['images2'],
'url4'=>$row['images3'],
'url5'=>$row['images4'],
'url6'=>$row['images5'],
'subject'=>$row['subject'],
'phone'=>$row['phone'],
'name'=>$row['name']));
}  
echo json_encode(array_values($result));

mysqli_close($conn);

?>

如果PHP发送没有内容的url2, url3, url4...，则应用程序chrash，但具有空值的phone, name, subject可以正常工作。

我认为Android在转换空图像URL和显示它方面存在问题

编辑：

很多用户说我必须添加Logcat:

07-16 13:12:10.713 1578-1990/system_process W/ActivityManager:   Force finishing activity com.example.jakob.webapplicationsave/.solutionTemplate
07-16 13:12:10.822 1578-1990/system_process W/ActivityManager:   Force finishing activity com.example.jakob.webapplicationsave/.Main2Activity
07-16 13:12:10.946 1578-2630/system_process I/OpenGLRenderer: Initialized EGL, version 1.4
07-16 13:12:10.947 1578-2630/system_process D/EGL_emulation: eglCreateContext: 0x9c2be040: maj 2 min 0 rcv 2
07-16 13:12:10.953 1578-2630/system_process D/EGL_emulation: eglMakeCurrent: 0x9c2be040: ver 2 0 (tinfo 0x9efbd6e0)
07-16 13:12:10.962 1578-2630/system_process D/EGL_emulation: eglMakeCurrent: 0x9c2be040: ver 2 0 (tinfo 0x9efbd6e0)
07-16 13:12:11.323 1578-1592/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{e46f507 u0 com.example.jakob.webapplicationsave/.solutionTemplate t497 f}
07-16 13:12:11.372 1930-2076/com.android.launcher3 I/OpenGLRenderer: Initialized EGL, version 1.4
07-16 13:12:11.374 1930-2076/com.android.launcher3 D/EGL_emulation: eglCreateContext: 0xae414660: maj 2 min 0 rcv 2
07-16 13:12:11.385 1930-2076/com.android.launcher3 D/EGL_emulation: eglMakeCurrent: 0xae414660: ver 2 0 (tinfo 0xae412440)
07-16 13:12:11.423 1930-2076/com.android.launcher3 D/EGL_emulation: eglMakeCurrent: 0xae414660: ver 2 0 (tinfo 0xae412440)
07-16 13:12:13.537 1270-1616/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 38006369 , only wrote 37870012
07-16 13:12:14.795 13519-13519/com.example.jakob.webapplicationsave I/Process: Sending signal. PID: 13519 SIG: 9
07-16 13:12:14.814 1578-2630/system_process D/EGL_emulation: eglMakeCurrent: 0x9c2be040: ver 2 0 (tinfo 0x9efbd6e0)
07-16 13:12:14.815 1578-2630/system_process E/Surface: getSlotFromBufferLocked: unknown buffer: 0x9b6834a0
07-16 13:12:14.830 1578-2182/system_process E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!  (parcel size = 104)
07-16 13:12:14.830 1578-2182/system_process W/InputMethodManagerService: Got RemoteException sending setActive(false) notification to pid 13519 uid 10062
07-16 13:12:14.833 1578-2182/system_process E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!  (parcel size = 104)
07-16 13:12:14.847 1578-1713/system_process D/GraphicsStats: Buffer count: 5
07-16 13:12:14.847 1578-1625/system_process W/InputDispatcher: channel '7af27b1 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.Main2Activity (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
07-16 13:12:14.847 1578-2182/system_process I/WindowState: WIN DEATH: Window{7af27b1 u0 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.Main2Activity}
07-16 13:12:14.847 1578-1625/system_process E/InputDispatcher: channel '7af27b1 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.Main2Activity (server)' ~ Channel is unrecoverably broken and will be disposed!
07-16 13:12:14.847 1578-1625/system_process W/InputDispatcher: channel 'cd3daa3 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.solutionTemplate (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
07-16 13:12:14.847 1578-1625/system_process E/InputDispatcher: channel 'cd3daa3 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.solutionTemplate (server)' ~ Channel is unrecoverably broken and will be disposed!
07-16 13:12:14.847 1578-2182/system_process W/InputDispatcher: Attempted to unregister already unregistered input channel '7af27b1 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.Main2Activity (server)'
07-16 13:12:14.848 1578-2179/system_process I/WindowState: WIN DEATH: Window{cd3daa3 u0 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.solutionTemplate}
07-16 13:12:14.848 1578-2179/system_process W/InputDispatcher: Attempted to unregister already unregistered input channel 'cd3daa3 com.example.jakob.webapplicationsave/com.example.jakob.webapplicationsave.solutionTemplate (server)'
07-16 13:12:14.853 1259-1259/? W/SurfaceFlinger: couldn't log to binary event log: overflow.
07-16 13:12:14.853 1578-1963/system_process I/ActivityManager: Process com.example.jakob.webapplicationsave (pid 13519) has died
07-16 13:12:15.026 1578-1597/system_process W/AppOps: Finishing op nesting under-run: uid 1000 pkg android code 24 time=0 duration=0 nesting=0
07-16 13:12:17.958 1270-1616/? W/audio_hw_generic: Not supplying enough data to HAL, expected position 38145850 , only wrote 38008822
07-16 13:13:00.065 1259-1351/? D/hwcomposer: hw_composer sent 312 syncs in 60s
07-16 13:14:00.056 1259-1351/? D/hwcomposer: hw_composer sent 5 syncs in 60s

您必须确保php代码中始终存在图像url。您可以使用一个逻辑，如果它是空的，那么将其设置为默认的图像url链接。例如src＝"；img/无照片.png"；。

并标记"；没有照片.png"；如已知的android上的字符串图像base64；没有照片.png"；在服务器上。

所以，在安卓代码上。当你看到网址是"；没有照片.png"；和base64字符串匹配，然后做点什么。

为什么我的应用程序在获取空数据时崩溃

我的问题是，当获取空的图像URL时，应用程序会崩溃

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