Table of Contents
Table of Contents
1.MainActivity
2.MainActivity2
3.MyHelper
4.OutCallReceiver
5.activity_main.xml
6.activity_main2.xml
7.item.xml
8.themes.xml
9. Project code layout
10. Operation status display
11. Common errors reported in this project and their solutions
Complete an app that intercepts dialing, including the following functions:
- Main functions: Save the number set by the user and intercept dialing to the number.
- Database: Save intercepted information, number, time or number of times, etc.
- Broadcast receiver: Perform dialing interception based on the saved number, save the interception information to the database, and jump to interface 2.
- Contains two interfaces:
Interface 1 (main interface) content: save interception numbers and display historical interception information;
Interface 2 content: Prompts the user that the dial-up has been intercepted, and the interface theme is set to a dialog-type theme.
Tip: Permissions required
Dynamic permission application:
public final void requestPermissions(
String[] permissions,
int requestCode)
When jumping to Activity2, you need to set intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1.MainActivity
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.health.PackageHealthStats;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private EditText et_ipnumber;
private SharedPreferences sp;
private RecyclerView rv;
private TextView update;
private MyAdapter myAdapter;
private List<Map<String, String>> datas;
private OutCallReceiver receiver;
private static final int FlatRequestCode = 1002;
private final String[] permissions = {"android.permission.READ_PHONE_STATE","android.permission.PROCESS_OUTGOING_CALLS","android.permission.SYSTEM_ALERT_WINDOW","android.permission.SYSTEM_OVERLAY_WINDOW"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (!checkPermission()) {
requestPermissions(permissions, 1);
}
MyHelper myHelper = new MyHelper(this);
datas = myHelper.getAll();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.intent.action.NEW_OUTGOING_CALLS");
intentFilter.addAction("android.intent.action.READ_PHONE_STATE");
receiver = new OutCallReceiver();
registerReceiver(receiver, intentFilter);
rv = findViewById(R.id.rv);
myAdapter = new MyAdapter();
rv.setAdapter(myAdapter);
rv.setLayoutManager(new LinearLayoutManager(this));
Button button = findViewById(R.id.btn_intercept);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
et_ipnumber = findViewById(R.id.et_ipnumber);
String number = et_ipnumber.getText().toString().trim();
sp = getSharedPreferences("itercept", MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString("number", number);
editor.commit();
Toast.makeText(MainActivity.this, "Save successfully", Toast.LENGTH_SHORT).show();
}
});
update = findViewById(R.id.tv_update);
update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
datas = myHelper.getAll();
myAdapter.notifyDataSetChanged();
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(receiver);
}
private boolean checkPermission() {
for (String p:permissions) {
if (checkSelfPermission(p) != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
return true;
}
class MyAdapter extends RecyclerView.Adapter<MyHolder> {
@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item, parent, false);
MyHolder holder = new MyHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull MyHolder holder, int position) {
String number = (String) datas.get(position).get("number");
String time = (String) datas.get(position).get("time");
holder.tv_number.setText(number);
holder.tv_time.setText(time);
}
@Override
public int getItemCount() {
return datas.size();
}
}
class MyHolder extends RecyclerView.ViewHolder {
TextView tv_number;
TextView tv_time;
public MyHolder(@NonNull View itemView) {
super(itemView);
tv_number = itemView.findViewById(R.id.tv_number);
tv_time = itemView.findViewById(R.id.tv_time);
}
}
}
2.MainActivity2
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity2 extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
}
3.MyHelper
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.appcompat.widget.ActionBarContextView;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MyHelper extends SQLiteOpenHelper {
private static final int version = 1;
private static final String db_name = "intercept.db";
MyHelper(Context context) {
super(context, db_name, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE call(_id INTEGER PRIMARY KEY AUTOINCREMENT, number VARCHAR(20), time VARCHAR(20))");
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
}
public void insert(String number) {
Calendar calendar = Calendar.getInstance();
Date date = calendar.getTime();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String formattedDate = dateFormat.format(date);
SQLiteDatabase db = getWritableDatabase();
ContentValues value = new ContentValues();
value.put("number", number);
value.put("time", formattedDate);
db.insert("call", null, value);
db.close();
}
public void delete(String number) {
SQLiteDatabase db = getWritableDatabase();
db.delete("call", "number=?", new String[]{number + ""});
db.close();
}
public List<Map<String, String>> getAll() {
List<Map<String, String>> result = new ArrayList<>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query("call", null, null, null, null, null, null);
if (cursor.getCount() != 0) {
while (cursor.moveToNext()) {
Map<String, String> map = new HashMap<>();
String number = cursor.getString(1);
String time = cursor.getString(2);
map.put("number", number);
map.put("time", time);
result.add(map);
}
}
cursor.close();
db.close();
return result;
}
}
4.OutCallReceiver
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
public class OutCallReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
SharedPreferences sp = context.getSharedPreferences("itercept", context.MODE_PRIVATE);
String number = sp.getString("number", "");
String outcallnumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
if (outcallnumber.equals(number)) {
setResultData(null);
MyHelper myHelper = new MyHelper(context);
myHelper.insert(number);
}
Intent intent1 = new Intent();
intent1.setClass(context, MainActivity2.class);
intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent1);
}
}
5.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFF0"
android:padding="15dp"
tools:context=".MainActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp">
<EditText
android:id="@ + id/et_ipnumber"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:hint="Please enter the blocking number"/>
<Button
android:id="@ + id/btn_intercept"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ACD6FF"
android:text="Save interception number"
android:textSize="16sp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#ACD6FF">
<TextView
android:id="@ + id/tv_update"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingRight="8dp"
android:paddingBottom="2dp"
android:text="Historical interception information"
android:textColor="#330000"
android:textSize="18sp"
android:layout_gravity="center"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@ + id/rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
6.activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFF0"
tools:context=".MainActivity2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="15dp"
android:text="Don't make trouble, study hard, and take class seriously! Don't make phone calls!"
android:textSize="26sp"/>
</LinearLayout>
7.item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp">
<TextView
android:id="@ + id/tv_number"
android:text="phone number"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="wrap_content"/>
<TextView
android:id="@ + id/tv_time"
android:text="Interception time"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"/>
</LinearLayout>
8.themes.xml
<resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Theme.Assess" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
<!-- Primary brand color. -->
<item name="colorPrimary">@color/purple_500</item>
<item name="colorPrimaryVariant">@color/purple_700</item>
<item name="colorOnPrimary">@color/white</item>
<!-- Secondary brand color. -->
<item name="colorSecondary">@color/teal_200</item>
<item name="colorSecondaryVariant">@color/teal_700</item>
<item name="colorOnSecondary">@color/black</item>
<!-- Status bar color. -->
<item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
<!-- Customize your theme here. -->
</style>
<style name="DialogActivity" parent="Theme.AppCompat.Light.Dialog">
<item name="colorPrimary">@color/purple_200</item>
<item name="colorPrimaryVariant">@color/purple_500</item>
<item name="colorOnPrimary">@color/black</item>
<!-- Secondary brand color. -->
<item name="colorSecondary">@color/teal_200</item>
<item name="colorSecondaryVariant">@color/teal_700</item>
<item name="colorOnSecondary">@color/black</item>
<!-- Status bar color. -->
<item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
<!-- Customize your theme here. -->
</style>
</resources>
8.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<uses-feature
android:name="android.hardware.telephony"
android:required="false" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.Assess"
tools:targetApi="31">
<activity
android:name=".MainActivity2"
android:exported="false"
android:theme="@style/DialogActivity"/>
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".OutCallReceiver"
android:enabled="true"
android:exported="true">
<intent-filter android:priority="1000">
<action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
</intent-filter>
</receiver>
</application>
</manifest>
9. Project code layout
10. Operation status display
11. Common errors and solutions for this project
1. The theme in the values folder must be written well, as it is easy to make mistakes here.
2. Learn to check the error messages displayed in logcat
