启动我的活动似乎有错误;找不到默认活动。代码如下：
此处显示代码
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"
> package="com.example.devnagi.callblocke">
>
>
> <uses-permission android:name="android.permission.CALL_PHONE" />
> <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
> <uses-permission android:name="android.permission.READ_PHONE_STATE" />
>
>
>
>
> [enter image description here][1]
> <uses-sdk
> android:minSdkVersion="14"
> android:targetSdkVersion="24" />
>
>
>
> <receiver android:name=".CallBarring">
> <intent-filter android:priority="100" >
> <action android:name="android.intent.action.PHONE_STATE" />
> </intent-filter>
> </receiver>
>
> <!--launched Activity -->
> <activity android:name=".MainActivity">
> <intent-filter>
> <action android:name="android.intent.action.MAIN" />
>
> <category android:name="android.intent.category.LAUNCHER" />
> </intent-filter>
>
> </activity>
> <activity
>
> android:name=".AddToBlocklistActivity"
>
> android:label="@string/app_name"
> />
>
>
>
>
> </manifest>
>
这里的Java代码
>
>
>
> package com.example.devnagi.callblocke.callblocker;
>
> import java.util.List;
>
> import android.app.AlertDialog; import android.content.Context; import
> android.content.DialogInterface; import android.content.Intent; import
> android.os.Bundle; import android.support.v7.app.ActionBarActivity;
> import android.view.LayoutInflater; import android.view.View; import
> android.view.View.OnClickListener; import android.view.ViewGroup;
> import android.widget.AdapterView; import
> android.widget.AdapterView.OnItemLongClickListener; import
> android.widget.ArrayAdapter; import android.widget.Button; import
> android.widget.ListView; import android.widget.TextView;
>
> import com.example.devnagi.callblocke.R;
>
> public class MainActivity extends ActionBarActivity implements
> OnClickListener, OnItemLongClickListener {
>
> // Declaration all on screen components of the Main screen private
> Button add_blacklist_btn; public ListView listview; // Object of
> BlacklistDAO to query to database private BlacklistDAO blackListDao;
> // It holds the list of Blacklist objects fetched from Database
> public static List<Blacklist> blockList;
> // This holds the value of the row number, which user has selected for further action private int selectedRecordPosition = -1;
>
> @Override protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.activity_main);
>
> // Initialization of the button of the Main screen
> add_blacklist_btn = (Button) findViewById(R.id.add_blacklist_btn);
>
> // Attachment of onClickListner for it
> add_blacklist_btn.setOnClickListener(this);
> // Initialization of the listview of the Main screen to display black listed phone numbers listview = (ListView)
> findViewById(R.id.listview);
> // Set the header of the ListView final LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); final View
> rowView = inflater.inflate(R.layout.list_item, listview, false);
> listview.addHeaderView(rowView);
> // Attach OnItemLongClickListener to track user action and perform accordingly listview.setOnItemLongClickListener(this); }
> private void populateNoRecordMsg() {
>
> // If, no record found in the database, appropriate message needs to
> be displayed. if(blockList.size() == 0) { final TextView tv =
> new TextView(this); tv.setPadding(5, 5, 5, 5);
> tv.setTextSize(15); tv.setText("No Record Found !!");
> listview.addFooterView(tv); } }
>
> @Override public void onClick(View v) { // Render
> AddToBlocklistActivity screen once click on "Add" Button if (v ==
> add_blacklist_btn) { startActivity(new Intent(this,
> AddToBlocklistActivity.class)); } } @Override public boolean
> onItemLongClick(AdapterView<?> parent, View view, int position, long
> id) { // If the pressed row is not a header, update
> selectedRecordPosition and // show dialog for further selection if
> (position > 0) { selectedRecordPosition = position - 1;
> showDialog(); } return true; } @Override protected void
> onResume() { super.onResume();
> // Initialize the DAO object blackListDao = new BlacklistDAO(this);
> // Fetch the list of Black listed numbers from Database using DAO object blockList = blackListDao.getAllBlacklist();
> // Remove the footer view if(listview.getChildCount() > 1) listview.removeFooterView(listview.getChildAt(listview.getChildCount()
> - 1));
> //Now, link the CustomArrayAdapter with the ListView listview.setAdapter(new CustomArrayAdapter(this, R.layout.list_item,
> blockList));
> // If, no record found in the database, appropriate message needs to be displayed. populateNoRecordMsg(); } private void
> showDialog() { // Before deletion of the long pressed record, need
> to confirm with the user. So, build the AlartBox first final
> AlertDialog.Builder alertDialogBuilder = new
> AlertDialog.Builder(this);
> // Set the appropriate message into it. alertDialogBuilder.setMessage("Are you Really want to delete the
> selected record ?");
> // Add a positive button and it's action. In our case action would be deletion of the data
> alertDialogBuilder.setPositiveButton("Delete",
> new DialogInterface.OnClickListener() {
> @Override
> public void onClick(DialogInterface arg0, int arg1) {
> try {
>
> blackListDao.delete(blockList.get(selectedRecordPosition));
>
> // Removing the same from the List to remove from display as well
> blockList.remove(selectedRecordPosition);
> listview.invalidateViews();
>
> // Reset the value of selectedRecordPosition
> selectedRecordPosition = -1;
> populateNoRecordMsg();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> });
> // Add a negative button and it's action. In our case, just hide the dialog box alertDialogBuilder.setNegativeButton("Cancel",
> new DialogInterface.OnClickListener() {
>
> @Override
> public void onClick(DialogInterface dialog, int which) {
> }
> });
>
> // Now, create the Dialog and show it. final AlertDialog
> alertDialog = alertDialogBuilder.create(); alertDialog.show(); }
> public class CustomArrayAdapter extends ArrayAdapter<String> {
>
> private LayoutInflater inflater;
> // This would hold the database objects i.e. Blacklist private List<Blacklist> records;
> @SuppressWarnings("unchecked") public CustomArrayAdapter(Context context, int resource,
> @SuppressWarnings("rawtypes") List objects) { super(context,
> resource, objects);
> this.records = objects; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); }
> @Override public View getView(int position, View convertView, ViewGroup parent) {
> //Reuse the view to make the scroll effect smooth if(convertView == null)
> convertView = inflater.inflate(R.layout.list_item, parent, false);
> // Fetch phone number from the database object final Blacklist phoneNumber = records.get(position);
> // Set to screen component to display results ((TextView)convertView.findViewById(R.id.serial_tv)).setText("" +
> (position +1));
> ((TextView)convertView.findViewById(R.id.phone_number_tv)).setText(phoneNumber.phoneNumber);
> return convertView; } } }
此屏幕截图显示了我在尝试运行应用程序时遇到的错误。它说'无法识别启动活动：找不到默认活动。启动活动时出错。 [1]：http://i.stack.imgur.com/vr1Jc.png
感谢您的帮助，谢谢您的帮助。
答案 0 :(得分：2)
如果您在升级IDEA，升级Android Studio版本或生成新APK后发现错误，则可能需要刷新和/或重新启动IDE缓存。
File -> Invalidate Caches / Restart