Hello World to open photo using Intent.ACTION_OPEN_DOCUMENT, with FloatingActionButton and Snackbar

This example work on last post "Updated Android Studio now provide template of Blank Activity with FloatingActionButton and Snackbar", modify the default Hello World to open image with ACTION_OPEN_DOCUMENT,  display on ImageView.


edit layout/activity_main.xml, to modify the icon of the FloatingActionButton, android:src inside <android.support.design.widget.FloatingActionButton>.

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
        android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
            android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton android:id="@+id/fab"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_menu_gallery" />

</android.support.design.widget.CoordinatorLayout>

layout/content_main.xml, it's the main layout of our app.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_main"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold"/>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:id="@+id/texturi"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <ImageView
                android:id="@+id/image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"/>

        </LinearLayout>
    </ScrollView>
</LinearLayout>

com.blogspot.android_er.androidhello.MainActivity.java

package com.blogspot.android_er.androidhello;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.FileNotFoundException;

public class MainActivity extends AppCompatActivity {

    private static final int RQS_OPEN_IMAGE = 1;

    ImageView imageView;
    TextView textUri;

    Bitmap bmOriginal = null;
    Uri targetUri = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Open photo", Snackbar.LENGTH_LONG)
                        .setAction("OK", snackbarOnClickListener)
                        .show();
            }
        });

        textUri = (TextView) findViewById(R.id.texturi);
        imageView = (ImageView) findViewById(R.id.image);
    }

    OnClickListener snackbarOnClickListener = new OnClickListener(){
        @Override
        public void onClick(View v) {

            bmOriginal = null;
            imageView.setImageBitmap(null);

            Intent intent = new Intent();

            if (Build.VERSION.SDK_INT >=
                    Build.VERSION_CODES.KITKAT) {
                intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
            } else {
                intent.setAction(Intent.ACTION_GET_CONTENT);
            }

            intent.addCategory(Intent.CATEGORY_OPENABLE);

            // set MIME type for image
            intent.setType("image/*");

            startActivityForResult(intent, RQS_OPEN_IMAGE);

        }
    };

    @TargetApi(Build.VERSION_CODES.KITKAT)
    @Override
    protected void onActivityResult(int requestCode,
                                    int resultCode, Intent data) {

        if (resultCode == Activity.RESULT_OK) {

            Uri dataUri = data.getData();

            if (requestCode == RQS_OPEN_IMAGE) {
                targetUri = dataUri;
                textUri.setText(dataUri.toString());
                updatImage(dataUri);
            }
        }

    }

    private void updatImage(Uri uri){

        if (uri != null){
            Bitmap bm;
            try {
                bm = BitmapFactory.decodeStream(
                        getContentResolver()
                                .openInputStream(uri));
                imageView.setImageBitmap(bm);
                bmOriginal = bm;

            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}

Download the files (Android Studio Format) .

Related:
- Using Intent.ACTION_OPEN_DOCUMENT, for KitKat API 19 or higher

Next:
- Apply photo effects using Media Effects APIs