这是我正在处理的代码。当我使用此代码运行我的应用程序时，它会停止，没有错误。
我已经更改了manifest.xml，但它无效。
public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ok=(Button)findViewById(R.id.Button01);
ok.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
new jsdetails().execute();
}
});
}
public class jsdetails extends AsyncTask<String,String,String> {
Boolean validUser = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Verifying.. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
//int valoreOnPostExecute = 0;
error=(TextView)findViewById(R.id.TextView01);
un=(EditText)findViewById(R.id.EditText01);
pw=(EditText)findViewById(R.id.EditText02);
params.add(new BasicNameValuePair("JS_Email",un.getText().toString()));
params.add(new BasicNameValuePair("JS_Password",pw.getText().toString()));
JSONObject json = jParser.makeHttpRequest(url,"POST",params);
Log.d("All Products: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1)
{
validUser = true;
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
if(validUser)
{
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish();
}
params.clear();
}
}
}
答案 0 :(得分：1)
您必须在UI Thread上进行查看操作。背景线程上的异步doInBackground方法。你没有在后台线程中获得editText的文本。
答案 1 :(得分：0)
试试这个..删除finish();
if(validUser)
{
Intent i = new Intent(MainActivity.this, UserManage.class);
startActivity(i);
}
答案 2 :(得分：0)
你在doinbackground（）方法中返回null而不是返回有效用户并在onPostExecute中
protected void onPostExecute(String validUser) {
pDialog.dismiss();
if(validUser)
{
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish();
}
params.clear();
}
}
答案 3 :(得分：0)
这样做
public class jsdetails extends AsyncTask<String,String,Boolean> {
Boolean validUser = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Verifying.. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected Boolean doInBackground(String... args) {
//int valoreOnPostExecute = 0;
error=(TextView)findViewById(R.id.TextView01);
un=(EditText)findViewById(R.id.EditText01);
pw=(EditText)findViewById(R.id.EditText02);
params.add(new BasicNameValuePair("JS_Email",un.getText().toString()));
params.add(new BasicNameValuePair("JS_Password",pw.getText().toString()));
JSONObject json = jParser.makeHttpRequest(url,"POST",params);
Log.d("All Products: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1)
{
validUser = true;
}
} catch (JSONException e) {
e.printStackTrace();
}
return validUser;
}
protected void onPostExecute(Boolean validUser) {
pDialog.dismiss();
if(validUser)
{
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish();
}
params.clear();
}
}
}***
答案 4 :(得分：0)
我做了一些改变和建议。请参阅以下代码。
public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
error=(TextView)findViewById(R.id.TextView01);
un=(EditText)findViewById(R.id.EditText01); // Note
pw=(EditText)findViewById(R.id.EditText02);
ok=(Button)findViewById(R.id.Button01);
ok.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
new jsdetails(MainActivity.this).execute(un.getText().toString(),pw.getText().toString());
// Note
}
});
}
public class jsdetails extends AsyncTask<String,Integer,Boolean > { // Note
Context context; // Note
Boolean validUser = false;
jsdetails(Context context){ // Note
this.context=context;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Verifying.. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected Boolean doInBackground(String... args) { // Note
//int valoreOnPostExecute = 0;
params.add(new BasicNameValuePair("JS_Email",args[0])); // Note
params.add(new BasicNameValuePair("JS_Password",args[1]));
JSONObject json = jParser.makeHttpRequest(url,"POST",params);
Log.d("All Products: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1)
{
validUser = true;
}
} catch (JSONException e) {
e.printStackTrace();
}
return validUser ;
}
protected void onPostExecute(String result) {
pDialog.dismiss();
if(result) // Note
{
Intent i = new Intent(context, UserManage.class); // Note
startActivity(i);
finish();
}
params.clear();
}
}
}