Android - 016 - Implicit Intents

android.016.java

//////////////////////////////////////////////////////////////////////////////////////////////
// in AndroidManifest.xml
//////////////////////////////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package=".......w3t1_impliziteintents_mariab">

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

    <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>

        <activity android:name=".Bildanzeige">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="image/*" />
            </intent-filter>
        </activity>

    </application>

</manifest>

//////////////////////////////////////////////////////////////////////////////////////////////
// in MainActivity
//////////////////////////////////////////////////////////////////////////////////////////////

public class MainActivity extends AppCompatActivity {

    private Button btnAnrufen;
    private Button btnAnrufEinleiten;
    private Button btnMaps;
    private Button btnSMS;
    private Button btnFoto;
    private ImageView ivBild;

    private void init() {
        MyOCL ocl = new MyOCL();

        btnAnrufen = findViewById(R.id.btnAnrufen);
        btnAnrufen.setOnClickListener(ocl);

        btnAnrufEinleiten = findViewById(R.id.btnAnrufEinleiten);
        btnAnrufEinleiten.setOnClickListener(ocl);

        btnMaps = findViewById(R.id.btnMaps);
        btnMaps.setOnClickListener(ocl);

        btnSMS = findViewById(R.id.btnSMS);
        btnSMS.setOnClickListener(ocl);

        btnFoto = findViewById(R.id.btnFoto);
        btnFoto.setOnClickListener(ocl);

        ivBild = findViewById(R.id.ivBild);

        String[] permissions = {Manifest.permission.CALL_PHONE,
                                Manifest.permission.SEND_SMS,
                                Manifest.permission.CAMERA};
        requestPermissions(permissions, 1);
    }

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

        init();

    }

    private class MyOCL implements View.OnClickListener {
        @Override
        public void onClick(View view) {
            switch (view.getId()) {
                case R.id.btnAnrufen:
                    anrufen();
                    break;
                case R.id.btnAnrufEinleiten:
                    anrufEinleiten();
                    break;
                case R.id.btnMaps:
                    maps();
                    break;
                case R.id.btnSMS:
                    sms();
                    break;
                case R.id.btnFoto:
                    foto();
                    break;
            }
        }
    }

    /*
     * Eine implizite Intent ist ein Aufruf einer App die wir nicht explizit festlegen, sondern
     * deren Name dem System bekannt zB das Telefonieren. Wir sagen mittels "Intent.ACTION_CALL",
     * dass eine bestimmte Nummer aufgerufen werden soll und das System ruft diese Nummer an
     * oder schlägt uns alle Apps vor, die in Frage kommen, von denen wir eine auswählen
     *
     * Die Info, die diese aufgerufene App verarbeiten soll, wird als URI uebergeben. Der Aufbau
      * ist immer der gleiche: Protokoll - Doppelpunkt - Info
     */
    private void anrufen() {
        Uri uri = Uri.parse("tel:+49 1234 567890");
        Intent intent = new Intent(Intent.ACTION_CALL, uri);

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE)
                ==PackageManager.PERMISSION_GRANTED) {

            startActivity(intent);

        } else {
            Toast.makeText(this,"keine Anruf-Berechtigung", Toast.LENGTH_LONG).show();
        }
    }

    private void anrufEinleiten() {
        Uri uri = Uri.parse("tel:+49 1234 567890");
        Intent intent = new Intent(Intent.ACTION_DIAL, uri);

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE)
                ==PackageManager.PERMISSION_GRANTED) {

            startActivity(intent);

        } else {
            Toast.makeText(this,"keine Anruf-Berechtigung", Toast.LENGTH_LONG).show();
        }
    }

    private void maps() {
        try {
            Uri uri = Uri.parse("geo:48.0571652,11.6588264");
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(intent);
        } catch (ActivityNotFoundException ex) {
            Toast.makeText(this,"keine App gefunden", Toast.LENGTH_LONG).show();
        }
    }

    private void sms() {
        Uri uri = Uri.parse("sms:+49 1234 567890?body=Hallo Maria");
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS)
                ==PackageManager.PERMISSION_GRANTED) {

            startActivity(intent);

        } else {
            Toast.makeText(this,"keine SMS-Berechtigung", Toast.LENGTH_LONG).show();
        }
    }

    private void foto() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                ==PackageManager.PERMISSION_GRANTED) {

            startActivityForResult(intent,0);

        } else {
            Toast.makeText(this,"keine Kamera-Berechtigung", Toast.LENGTH_LONG).show();
        }
    }

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

        if ((resultCode==RESULT_OK) && (requestCode==0)) {
            Bundle extras = data.getExtras();

            // Bitmap aus dem Bundle lesen, Key ist "data"
            Bitmap bm = (Bitmap)extras.get("data");

            // Bild in der ImageView anzeigen
            ivBild.setImageBitmap(bm);
        }
    }

}

//////////////////////////////////////////////////////////////////////////////////////////////
// in Bildanzeige
//////////////////////////////////////////////////////////////////////////////////////////////

public class Bildanzeige extends AppCompatActivity {

    private ImageView bild;

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

        bild = findViewById(R.id.bild);
        Intent intent = getIntent();
        Uri uri = intent.getData();

        bild.setImageURI(uri);
    }
}