如何在 android 中无错误地传递字符串 - 在附加堆栈跟踪中获取资源但从未释放 -
How to pass string in android without error- A resource was acquired at attached stack trace but never released-
我尝试将 stringBuilder 对象提取到我的主 activity。我检查了我的 json 文件或解析代码,它们运行良好。但是,当我尝试获取 stringbuilder 时出现错误:
资源已在附加堆栈跟踪中获取但从未释放。有关避免资源泄漏的信息,请参阅 java.io.Closeable。
java.lang.Throwable: 未调用显式终止方法 'close'
Server.java的代码如下
`
public class Server extends Activity {
static StringBuilder stringBuilder = new StringBuilder();
public Server(){
try {
JSONObject obj = new JSONObject(loadJSONFromAsset());
JSONArray project = obj.getJSONArray("project");
for (int i = 0; i < project.length(); i++) {
JSONObject ss = project.getJSONObject(i);
stringBuilder.append(ss.getString("title") + "\n");
JSONArray post = ss.getJSONArray("posts");
for(int j = 0; j < post.length();j++){
JSONObject posts = post.getJSONObject(j);
stringBuilder.append(posts.getString("id") +"\n");
JSONArray tag = posts.getJSONArray("tags");
for(int k = 0; k < tag.length();k++){
stringBuilder.append(tag.getString(k) +"\n");
}
}
}
}
catch (JSONException e) {
stringBuilder.append("error");
e.printStackTrace();
}
}
public String getString(){
return stringBuilder.toString();
}
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("cat.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}}
这是我的 MainActivity.java
public class MainActivity extends Activity {
TextView jsonDataTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
jsonDataTextView = (TextView) findViewById(R.id.textView);
Server s = new Server();
jsonDataTextView.setText(s.stringBuilder.toString());} }
有什么解决办法吗?
InputStream
可能不会在您的 loadJSONFromAsset
方法的 try
块中关闭,它应该关闭。
public String loadJSONFromAsset() {
String json = null;
InputStream is = null;
try {
is = getAssets().open("cat.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
json = new String(buffer, "UTF-8");
}
catch (IOException ex) {
ex.printStackTrace();
}
finally {
if (is != null) {
try {
is.close();
}
catch (IOException ex) {
// Do you want to handle this exception?
}
}
}
return json;
}
注意:在你的 Server
构造函数中有些东西困扰我,在 catch
块中你试图将 "error" 附加到你的 StringBuilder
。你知道吗,这里的 StringBuilder
可能不为空。事实上,在 try
块中,一次(或多次)尝试向其附加一些字符串可能会在某些时候出现问题之前起作用。
注 2:服务器作为非 Activity
public class Server {
private Context mContext;
public Server(Context context) {
mContext = context;
...
}
...
public String loadJSONFromAsset() {
...
mContext.getAssets().open("cat.json");
}
}
然后在您的 MainActivity
Server s = new Server(this);
我尝试将 stringBuilder 对象提取到我的主 activity。我检查了我的 json 文件或解析代码,它们运行良好。但是,当我尝试获取 stringbuilder 时出现错误: 资源已在附加堆栈跟踪中获取但从未释放。有关避免资源泄漏的信息,请参阅 java.io.Closeable。 java.lang.Throwable: 未调用显式终止方法 'close'
Server.java的代码如下
`
public class Server extends Activity {
static StringBuilder stringBuilder = new StringBuilder();
public Server(){
try {
JSONObject obj = new JSONObject(loadJSONFromAsset());
JSONArray project = obj.getJSONArray("project");
for (int i = 0; i < project.length(); i++) {
JSONObject ss = project.getJSONObject(i);
stringBuilder.append(ss.getString("title") + "\n");
JSONArray post = ss.getJSONArray("posts");
for(int j = 0; j < post.length();j++){
JSONObject posts = post.getJSONObject(j);
stringBuilder.append(posts.getString("id") +"\n");
JSONArray tag = posts.getJSONArray("tags");
for(int k = 0; k < tag.length();k++){
stringBuilder.append(tag.getString(k) +"\n");
}
}
}
}
catch (JSONException e) {
stringBuilder.append("error");
e.printStackTrace();
}
}
public String getString(){
return stringBuilder.toString();
}
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("cat.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}}
这是我的 MainActivity.java
public class MainActivity extends Activity {
TextView jsonDataTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
jsonDataTextView = (TextView) findViewById(R.id.textView);
Server s = new Server();
jsonDataTextView.setText(s.stringBuilder.toString());} }
有什么解决办法吗?
InputStream
可能不会在您的 loadJSONFromAsset
方法的 try
块中关闭,它应该关闭。
public String loadJSONFromAsset() {
String json = null;
InputStream is = null;
try {
is = getAssets().open("cat.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
json = new String(buffer, "UTF-8");
}
catch (IOException ex) {
ex.printStackTrace();
}
finally {
if (is != null) {
try {
is.close();
}
catch (IOException ex) {
// Do you want to handle this exception?
}
}
}
return json;
}
注意:在你的 Server
构造函数中有些东西困扰我,在 catch
块中你试图将 "error" 附加到你的 StringBuilder
。你知道吗,这里的 StringBuilder
可能不为空。事实上,在 try
块中,一次(或多次)尝试向其附加一些字符串可能会在某些时候出现问题之前起作用。
注 2:服务器作为非 Activity
public class Server {
private Context mContext;
public Server(Context context) {
mContext = context;
...
}
...
public String loadJSONFromAsset() {
...
mContext.getAssets().open("cat.json");
}
}
然后在您的 MainActivity
Server s = new Server(this);