public class LoginActivity extends Activity implements LoaderCallbacks<Cursor> {
private static final String DUMMY_CREDENTIALS = "user@test.com:hello";
private UserLoginTask userLoginTask = null;
private View loginFormView;
private View progressView;
private AutoCompleteTextView emailTextView;
private EditText passwordTextView;
private TextView signUpTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
emailTextView = (AutoCompleteTextView) findViewById(R.id.email);
loadAutoComplete();
passwordTextView = (EditText) findViewById(R.id.password);
passwordTextView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == EditorInfo.IME_NULL) {
initLogin();
return true;
}
return false;
}
});
Button loginButton = (Button) findViewById(R.id.email_sign_in_button);
loginButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
initLogin();
}
});
loginFormView = findViewById(R.id.login_form);
progressView = findViewById(R.id.login_progress);
//adding underline and link to signup textview
signUpTextView = (TextView) findViewById(R.id.signUpTextView);
signUpTextView.setPaintFlags(signUpTextView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
Linkify.addLinks(signUpTextView, Linkify.ALL);
signUpTextView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.i("LoginActivity", "Sign Up Activity activated.");
// this is where you should start the signup Activity
// LoginActivity.this.startActivity(new Intent(LoginActivity.this, SignupActivity.class));
}
});
}
private void loadAutoComplete() {
getLoaderManager().initLoader(0, null, this);
}
/**
* Validate Login form and authenticate.
*/
public void initLogin() {
if (userLoginTask != null) {
return;
}
emailTextView.setError(null);
passwordTextView.setError(null);
String email = emailTextView.getText().toString();
String password = passwordTextView.getText().toString();
boolean cancelLogin = false;
View focusView = null;
if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
passwordTextView.setError(getString(R.string.invalid_password));
focusView = passwordTextView;
cancelLogin = true;
}
if (TextUtils.isEmpty(email)) {
emailTextView.setError(getString(R.string.field_required));
focusView = emailTextView;
cancelLogin = true;
} else if (!isEmailValid(email)) {
emailTextView.setError(getString(R.string.invalid_email));
focusView = emailTextView;
cancelLogin = true;
}
if (cancelLogin) {
// error in login
focusView.requestFocus();
} else {
// show progress spinner, and start background task to login
showProgress(true);
userLoginTask = new UserLoginTask(email, password);
userLoginTask.execute((Void) null);
}
}
private boolean isEmailValid(String email) {
//add your own logic
return email.contains("@");
}
private boolean isPasswordValid(String password) {
//add your own logic
return password.length() > 4;
}
/**
* Shows the progress UI and hides the login form.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
public void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
loginFormView.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
progressView.animate().setDuration(shortAnimTime).alpha(
show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
progressView.setVisibility(show ? View.VISIBLE : View.GONE);
loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
return new CursorLoader(this,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE +
" = ?", new String[]{ContactsContract.CommonDataKinds.Email
.CONTENT_ITEM_TYPE},
// Show primary email addresses first. Note that there won't be
// a primary email address if the user hasn't specified one.
ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
}
@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
List<String> emails = new ArrayList<String>();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
emails.add(cursor.getString(ProfileQuery.ADDRESS));
cursor.moveToNext();
}
addEmailsToAutoComplete(emails);
}
@Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
}
private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(LoginActivity.this,
android.R.layout.simple_dropdown_item_1line, emailAddressCollection);
emailTextView.setAdapter(adapter);
}
private interface ProfileQuery {
String[] PROJECTION = {
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
};
int ADDRESS = 0;
int IS_PRIMARY = 1;
}
/**
* Async Login Task to authenticate
*/
public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
private final String emailStr;
private final String passwordStr;
UserLoginTask(String email, String password) {
emailStr = email;
passwordStr = password;
}
@Override
protected Boolean doInBackground(Void... params) {
//this is where you should write your authentication code
// or call external service
// following try-catch just simulates network access
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
return false;
}
//using a local dummy credentials store to authenticate
String[] pieces = DUMMY_CREDENTIALS.split(":");
if (pieces[0].equals(emailStr) && pieces[1].equals(passwordStr)) {
return true;
} else {
return false;
}
}
@Override
protected void onPostExecute(final Boolean success) {
userLoginTask = null;
//stop the progress spinner
showProgress(false);
if (success) {
// login success and move to main Activity here.
} else {
// login failure
passwordTextView.setError(getString(R.string.incorrect_password));
passwordTextView.requestFocus();
}
}
@Override
protected void onCancelled() {
userLoginTask = null;
show Progress(false);
}
。在运行代码之后，它会抛出异常：
08-01 20：45：09.682 2253-2297 / com.example.abhisheksharma1.bridgeapp E / AndroidRuntime：致命异常：AsyncTask＃1流程： com.example.abhisheksharma1.bridgeapp，PID：2253 java.lang.RuntimeException：执行时发生错误 doInBackground（）在android.os.AsyncTask $ 3.done（AsyncTask.java:300）at at java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355） at java.util.concurrent.FutureTask.setException（FutureTask.java:222） 在java.util.concurrent.FutureTask.run（FutureTask.java:242）at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） 在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:587） 在java.lang.Thread.run（Thread.java:818）引起： java.lang.SecurityException：Permission Denial：打开提供者 来自的com.android.providers.contacts.ContactsProvider2 ProcessRecord {1f2048ab 2253：com.example.abhisheksharma1.bridgeapp / u0a50}（pid = 2253， uid = 10050）需要android.permission.READ_CONTACTS或 android.permission.WRITE_CONTACTS在 android.os.Parcel.readException（Parcel.java:1540）at android.os.Parcel.readException（Parcel.java:1493）at android.app.ActivityManagerProxy.getContentProvider（ActivityManagerNative.java:3267） 在 android.app.ActivityThread.acquireProvider（ActivityThread.java:4589） 在 android.app.ContextImpl $ ApplicationContentResolver.acquireUnstableProvider（ContextImpl.java:2439） 在 android.content.ContentResolver.acquireUnstableProvider（ContentResolver.java:1442） 在android.content.ContentResolver.query（ContentResolver.java:462）at android.content.CursorLoader.loadInBackground（CursorLoader.java:64）at android.content.CursorLoader.loadInBackground（CursorLoader.java:42）at android.content.AsyncTaskLoader.onLoadInBackground（AsyncTaskLoader.java:312） 在 android.content.AsyncTaskLoader $ LoadTask.doInBackground（AsyncTaskLoader.java:69） 在 android.content.AsyncTaskLoader $ LoadTask.doInBackground（AsyncTaskLoader.java:57） 在android.os.AsyncTask $ 2.call（AsyncTask.java:288）at java.util.concurrent.FutureTask.run（FutureTask.java:237）
在 java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） 在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:587） 在java.lang.Thread.run（Thread.java:818）
信息：Gradle任务[：app：assembleDebug] ：app：preBuild UP-TO-DATE ：app：preDebugBuild UP-TO-DATE ：app：compileDebugNdk UP-TO-DATE ：应用：checkDebugManifest ：app：preReleaseBuild UP-TO-DATE ：app：prepareComAndroidSupportAppcompatV72200Library UP-TO-DATE ：app：prepareComAndroidSupportSupportV42200Library UP-TO-DATE ：应用：prepareDebugDependencies ：app：compileDebugAidl UP-TO-DATE ：app：compileDebugRenderscript UP-TO-DATE ：app：generateDebugBuildConfig UP-TO-DATE ：app：generateDebugAssets UP-TO-DATE ：app：mergeDebugAssets UP-TO-DATE ：app：generateDebugResValues UP-TO-DATE ：app：generateDebugResources UP-TO-DATE ：app：mergeDebugResources UP-TO-DATE ：app：processDebugManifest UP-TO-DATE ：应用：processDebugResources C：\ Users \用户Abhishesk.Sharma1 \ AndroidStudioProjects \ BridgeApp \程序\编译\ \中间体舱单\全\调试\ AndroidManifest.xml中 错误：（42,28）找不到与给定名称匹配的资源（值为＆＃39;值为＆＃39; @ integer / google_play_services_version＆＃39;）。 错误：任务＆＃39;：app：processDebugResources＆＃39;执行失败。
com.android.ide.common.process.ProcessException：org.gradle.process.internal.ExecException：进程＆＃39;命令＆＃39; C：\ Users \ Abhishesk.Sharma1 \ AppData \ Local \ Android \ SDK \构建工具\ 21.1.2 \ aapt.exe＆＃39;＆＃39;完成非零退出值1 信息：建筑失败 信息：总时间：3.495秒 信息：2个错误 信息：0警告 信息：请参阅控制台中的完整输出
答案 0 :(得分：1)
在AndroidManifest.xml中添加以下权限
<uses-permission android:name="android.permission.READ_CONTACTS " />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
答案 1 :(得分：0)
查看堆栈跟踪我注意到您必须在清单上设置此权限：
android.permission.READ_CONTACTS
android.permission.WRITE_CONTACTS
引起：java.lang.SecurityException：权限拒绝：打开 提供者com.android.providers.contacts.ContactsProvider2来自 ProcessRecord {1f2048ab 2253：com.example.abhisheksharma1.bridgeapp / u0a50}（pid = 2253， uid = 10050）需要android.permission.READ_CONTACTS或 android.permission.WRITE_CONTACTS