Die Anleitung zu Android Phone Calls

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1- Android Phone Call

In Android ist es für Sie einfach, einen Anruf von Ihrer Anwendung aus zu tätigen, indem Sie eine implizite Intent, ACTION_CALL, erstellen und dann an das System senden, um den Start der im System verfügbaren anrufenden Anwendung anzufordern.
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" + phoneNumber));

startActivity(callIntent);
Schauen Sie das Beispiel vor:
Auf  Android Studio erstellen Sie das Projekt:
  • File > New > New Project > Empty Activity
    • Name: PhoneCallExample
    • Package name: org.o7planning.phonecallexample
    • Language: Java
Ihre Anwendung braucht die Berechtigung, die Anrufe durchzuführen. Deshalb braucht es, dass die folgende Code nach der File  AndroidManifest.xml hinzufügt wird:

<uses-permission android:name="android.permission.CALL_PHONE" />
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.phonecallexample">

    <uses-permission android:name="android.permission.CALL_PHONE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
Darüber hinaus möchte eine Anwendung ab Android 6.0 (API Level 23) einen Anruf tätigen. Sie muss vom Benutzer die Erlaubnis erhalten. Daher müssen Sie einige zusätzliche Verarbeitungsaktionen in der Anwendung haben (siehe Beispielcode).
Die Interface der Anwendung:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/editText_phoneNumber"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:gravity="center"
        android:inputType="phone"
        android:text="+15555219999"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button_call"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Call by Intent.ACTION_CALL"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_phoneNumber" />

</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.phonecallexample;


import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST_CODE_CALL_PHONE = 555;

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumber;
    private Button buttonCall;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.editTextPhoneNumber = (EditText) this.findViewById(R.id.editText_phoneNumber);
        this.buttonCall = (Button) this.findViewById(R.id.button_call);

        this.buttonCall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                askPermissionAndCall();
            }
        });
    }

    private void askPermissionAndCall() {

        // With Android Level >= 23, you have to ask the user
        // for permission to Call.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) { // 23

            // Check if we have Call permission
            int sendSmsPermisson = ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.CALL_PHONE);

            if (sendSmsPermisson != PackageManager.PERMISSION_GRANTED) {
                // If don't have permission so prompt the user.
                this.requestPermissions(
                        new String[]{Manifest.permission.CALL_PHONE},
                        MY_PERMISSION_REQUEST_CODE_CALL_PHONE
                );
                return;
            }
        }
        this.callNow();
    }

    @SuppressLint("MissingPermission")
    private void callNow() {
        String phoneNumber = this.editTextPhoneNumber.getText().toString();

        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:" + phoneNumber));
        try {
            this.startActivity(callIntent);
        } catch (Exception ex) {
            Toast.makeText(getApplicationContext(),"Your call failed... " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }


    // When you have the request results
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //
        switch (requestCode) {
            case MY_PERMISSION_REQUEST_CODE_CALL_PHONE: {

                // Note: If request is cancelled, the result arrays are empty.
                // Permissions granted (CALL_PHONE).
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Log.i( LOG_TAG,"Permission granted!");
                    Toast.makeText(this, "Permission granted!", Toast.LENGTH_LONG).show();

                    this.callNow();
                }
                // Cancelled or denied.
                else {
                    Log.i( LOG_TAG,"Permission denied!");
                    Toast.makeText(this, "Permission denied!", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
    }

    // When results returned
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == MY_PERMISSION_REQUEST_CODE_CALL_PHONE) {
            if (resultCode == RESULT_OK) {
                // Do something with data (Result returned).
                Toast.makeText(this, "Action OK", Toast.LENGTH_LONG).show();
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Action Cancelled", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Action Failed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

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