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Friday, 23 August 2013

Share bitmap between Activities

14:14
This exercise demonstrate how to using static Bitmap in a common class in application, to share between activities. Such that, no need to pass between activities.




CommonBitmap.java, it simple hold a static Bitmap. It can be accessed by all activities in application, using CommonBitmap.bitmap.
package com.example.androidcommonbitmap;

import android.graphics.Bitmap;

public class CommonBitmap {
public static Bitmap bitmap = null;
}


MainActivity.java
package com.example.androidcommonbitmap;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import android.content.Intent;
import android.graphics.BitmapFactory;

public class MainActivity extends Activity {

Button btnLoadImage1;
TextView textSource1;
Button btnStartActivity;
ImageView imageResult;

final int RQS_LOADIMAGE = 1;
final int RQS_ACTIVITY2 = 2;

Uri source1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnLoadImage1 = (Button)findViewById(R.id.loadimage1);
textSource1 = (TextView)findViewById(R.id.sourceuri1);
btnStartActivity = (Button)findViewById(R.id.startactivity);
imageResult = (ImageView)findViewById(R.id.result);

btnLoadImage1.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, RQS_LOADIMAGE);
}});

btnStartActivity.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
Intent intent = new Intent(MainActivity.this, Activity2.class);
startActivityForResult(intent, RQS_ACTIVITY2);
}});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK){
switch (requestCode){
case RQS_LOADIMAGE:
source1 = data.getData();
textSource1.setText(source1.toString());

try {
//save common static bitmap
CommonBitmap.bitmap = BitmapFactory.decodeStream(
getContentResolver().openInputStream(source1));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case RQS_ACTIVITY2:
imageResult.setImageBitmap(CommonBitmap.bitmap);
break;
}
}
}

}


activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >

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

<Button
android:id="@+id/loadimage1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Load Image 1" />
<TextView
android:id="@+id/sourceuri1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<Button
android:id="@+id/startactivity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Start Another Activity" />
<ImageView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>


Activity2.java, code of the second activity.
package com.example.androidcommonbitmap;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class Activity2 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2_layout);

ImageView image2 = (ImageView)findViewById(R.id.image2);
image2.setImageBitmap(CommonBitmap.bitmap);

Button btnFinish = (Button)findViewById(R.id.finish);
btnFinish.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
setResult(RESULT_OK);
finish();
}});
}

}


activity2_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold"
android:layout_gravity="center_horizontal"
android:autoLink="web" />
<Button
android:id="@+id/finish"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Finish" />
<ImageView
android:id="@+id/image2"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>


Finally, add the second activity Activity2.java to AndroidManifest.xml.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidcommonbitmap"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.androidcommonbitmap.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.androidcommonbitmap.Activity2"
android:label="@string/app_name" >
</activity>
</application>

</manifest>


download filesDownload the files.



more: Something about processing images in Android

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