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swdev:android:start [2018/04/30 23:40]
smayr [Explicit Intent] 		swdev:android:start [2018/05/22 14:15] (current)
smayr [Resources]
Line 5: Line 5:
     * [[https://developer.android.com/index.html|Android Development Resources]]     * [[https://developer.android.com/index.html|Android Development Resources]]
     * [[https://developer.android.com/studio/index.html|Android Studio (IDE)]]     * [[https://developer.android.com/studio/index.html|Android Studio (IDE)]]
 +    * [[https://flutter.io/get-started/codelab/|Flutter (IDE)]]
     * [[https://www.visualstudio.com|Visual Studio (IDE) + Xamarin]] - Select //Community Edition//     * [[https://www.visualstudio.com|Visual Studio (IDE) + Xamarin]] - Select //Community Edition//
  
Line 127: Line 128:
 if (intentDialNumber.resolveActivity(getPackageManager()) != null) { if (intentDialNumber.resolveActivity(getPackageManager()) != null) {
     startActivity(intentDialNumber);     startActivity(intentDialNumber);
 +}
 +
 +// Call contacts to handle contact selection
 +Intent intentSelectContact = new Intent(Intent.ACTION_DIAL, new Uri("content://contacts"));
 +if (intentSelectContact.resolveActivity(getPackageManager()) != null) {
 +    startActivity(intentSelectContact);
 } }
  
Line 166: Line 173:
                 intentDataHandler.putExtra("Key2", "Value2");  // data payload (optional)                 intentDataHandler.putExtra("Key2", "Value2");  // data payload (optional)
                 intentDataHandler.putExtra("com.acme.myapp.Key3", "Value3");  // use full path with key (recommended)                 intentDataHandler.putExtra("com.acme.myapp.Key3", "Value3");  // use full path with key (recommended)
 +                intentDataHandler.putExtra("Key4.TEAM_OBJ", aTeamObj); // parcelable object (eg. object of type Team)
                 startActivity(intentDataHandler);                 startActivity(intentDataHandler);
                 break;                 break;
Line 184: Line 192:
         setContentView(R.layout.activity_target);         setContentView(R.layout.activity_target);
                  
-        Bundle bundle = getIntent().getExtras();   // get data payload (if available)+        //----------------------------------- 
 +        // Get data payload (if available) 
 +        //----------------------------------- 
 +        // Method 1 
 +        Bundle bundle = getIntent().getExtras();   
         String str = bundle.getString("Key1");         String str = bundle.getString("Key1");
-         
         Toast.makeText(this, str, Toast.LENGTH_SHORT).show();         Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
                  
-        // Better yet +        // Method 2 
-        if (getIntent().hasExtra("Key2")) { +        Intent intent = getIntent(); 
-            str = getIntent().getExtras().getString("Key2");+        if (intent.hasExtra("Key2")) { 
 +            str = intent.getExtras().getString("Key2");
             Toast.makeText(this, str, Toast.LENGTH_SHORT).show();             Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
 +        } 
 +         
 +        // Method 3 
 +        if (getIntent().hasExtra("Key3")) { 
 +            str = getIntent().getExtras().getString("Key3"); 
 +            Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); 
 +        } 
 +         
 +        // Parcelable data 
 +        Team objTeam; 
 +        if (intent.hasExtra("Key4.TEAM_OBJ")) { 
 +            Log.d("MyApp", "Retrieving intent extras..."); 
 +            objTeam = intent.getParcelableExtra("Key4.TEAM_OBJ"); 
 +            Toast.makeText(this, "Team Name: "+ objTeam.name, Toast.LENGTH_SHORT).show();
         }         }
     }     }
Line 199: Line 224:
 </code> </code>
  
 +A parcelable extra must be of a type supporting parcelable.  For example:
 +<code java>
 +package com.acme.myapp;
 +
 +import android.os.Parcel;
 +import android.os.Parcelable;
 +
 +public class Team implements Parcelable
 +{
 +    public long id = 0;
 +    public String name = "";
 +    public String number = "";
 +    public int ranking = 0;
 +
 +    // Default constructor
 +    Team()
 +    {
 +
 +    }
 +
 +    // In constructor, read variables from Parcel. 
 +    // Important: Read them in the same sequence in which they were written in Parcel.
 +    public Team(Parcel in) {
 +        id = in.readLong();
 +        name = in.readString();
 +        number = in.readString();
 +        ranking = in.readInt();
 +    }
 +
 +    @Override
 +    public int describeContents() {
 +        return 0;
 +    }
 +
 +    // Write member variables in Parcel. 
 +    // Write in any order. Not required to write all members in Parcel.
 +    @Override
 +    public void writeToParcel(Parcel dest, int flags) {
 +        // Write data in any order
 +        dest.writeLong(id);
 +        dest.writeString(name);
 +        dest.writeString(number);
 +        dest.writeInt(ranking);
 +    }
 +
 +    // De-serialize the object
 +    public static final Parcelable.Creator<Team> CREATOR = new Parcelable.Creator<Team>(){
 +        public Team createFromParcel(Parcel in) {
 +            return new Team(in);
 +        }
 +
 +        public Team[] newArray(int size) {
 +            return new Team[size];
 +        }
 +    };
 +}
 +</code>
 === Intent Examples === === Intent Examples ===
 For example, in the ''MainActivity'', you can define an intent: For example, in the ''MainActivity'', you can define an intent:
Line 229: Line 311:
             case R.id.btnDialNumber:             case R.id.btnDialNumber:
                 Intent intentDialNumber = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:4071233500"));                 Intent intentDialNumber = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:4071233500"));
-                startActivity(intentDialNumber);+                if (intentDialNumber.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentDialNumber); 
 +                }
                 break;                 break;
                                  
             case R.id.btnViewWebsite:             case R.id.btnViewWebsite:
                 Intent intentViewWebsite = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.acme.com"));                 Intent intentViewWebsite = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.acme.com"));
-                startActivity(intentViewWebsite);+                if (intentViewWebsite.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentViewWebsite); 
 +                }
                 break;                 break;
                                  
Line 240: Line 326:
                 Intent intentShowLocation = new Intent(Intent.ACTION_VIEW,                  Intent intentShowLocation = new Intent(Intent.ACTION_VIEW, 
                     Uri.parse("geo:28.6027902,-81.4232732,14z"   // lat,long,zoom                     Uri.parse("geo:28.6027902,-81.4232732,14z"   // lat,long,zoom
-                ));   +                )); 
-                startActivity(intentShowLocation);+                if (intentShowLocation.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentShowLocation); 
 +                }
                 break;                 break;
                                  
Line 247: Line 335:
                 // Display all activities supporting Action View that can handle intent                 // Display all activities supporting Action View that can handle intent
                 Intent intentShowAllActivities = new Intent(Intent.ACTION_VIEW);                 Intent intentShowAllActivities = new Intent(Intent.ACTION_VIEW);
-                startActivity(intentShowAllActivities);+                if (intentShowAllActivities.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentShowAllActivities); 
 +                }
                 break;                 break;
                                  
Line 254: Line 344:
                     SampleActivity.class   // target activity                     SampleActivity.class   // target activity
                 );                 );
-                startActivity(intentShowToast);+                if (intentShowToast.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentShowToast); 
 +                }
                 break;                 break;
                          
             case R.id.btnShowSampleActivity:             case R.id.btnShowSampleActivity:
                 Intent intentShowSampleActivity = new Intent("com.acme.myapp.SampleActivity");                              Intent intentShowSampleActivity = new Intent("com.acme.myapp.SampleActivity");             
-                startActivity(intentShowSampleActivity);+                if (intentShowSampleActivity.resolveActivity(getPackageManager()) != null) { 
 +                    startActivity(intentShowSampleActivity); 
 +                }
                 break;                 break;
         }         }
swdev/android/start.1525146022.txt.gz · Last modified: 2018/04/30 23:40 by smayr
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