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();
}
}
}
}
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