> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/android/compare-files/file-comparison-a.md).
# File comparison in Android
Visually compare pages with ease using the resolution-independent comparison tool. Integrate UI components in your app with Standalone activity and Comparison options dialog. Follow Android best pract
You can visually compare pages. This resolution independent comparison allows you to quickly spot differences between pages.
There are two main ways to integrate the out-of-box UI components in your application:
1. [Standalone activity](https://docs.apryse.com)
2. [Comparison options dialog](https://docs.apryse.com)
## Standalone activity
The [`DiffActivity`](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/controls/DiffActivity.html) is a standalone component that handles from picking two files to generating the comparison result.
1. Define the activity
{% hint style="warning" %}
**Storage Permission**
Please follow the latest Android best practices and guidelines outlined [here](https://developer.android.com/training/permissions/usage-notes/)
{% endhint %}
{% tabs %}
{% tab title="XML" %}
{% code lineNumbers="true" %}
```xml
```
{% endcode %}
{% endtab %}
{% endtabs %}
1. Show the activity
{% tabs %}
{% tab title="Java" %}
{% code lineNumbers="true" %}
```java
DiffActivity.open(this);
```
{% endcode %}
{% endtab %}
{% tab title="Kotlin" %}
{% code lineNumbers="true" %}
```kotlin
DiffActivity.open(this)
```
{% endcode %}
{% endtab %}
{% endtabs %}
## Comparison options dialog
If you have your own viewer already and only want to show the comparison options in your application, the [`DiffOptionsDialogFragment`](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/dialog/diffing/DiffOptionsDialogFragment.html) can be used.
{% tabs %}
{% tab title="Java" %}
{% code lineNumbers="true" %}
```java
public void show(final Context context, FragmentManager fragmentManager, final ArrayList files) {
DiffOptionsDialogFragment fragment = DiffOptionsDialogFragment.newInstance(
files.get(0), files.get(1)
);
fragment.setStyle(DialogFragment.STYLE_NORMAL, R.style.PDFTronAppTheme);
fragment.setDiffOptionsDialogListener(new DiffOptionsDialogFragment.DiffOptionsDialogListener() {
@Override
public void onDiffOptionsConfirmed(int color1, int color2, int blendMode) {
compareFiles(context, files, color1, color2, blendMode);
}
});
fragment.show(fragmentManager, DiffOptionsDialogFragment.TAG);
}
```
{% endcode %}
{% endtab %}
{% tab title="Kotlin" %}
{% code lineNumbers="true" %}
```kotlin
fun show(context: Context, fragmentManager: FragmentManager, files: ArrayList) {
val fragment = DiffOptionsDialogFragment.newInstance(
files[0], files[1]
)
fragment.setStyle(DialogFragment.STYLE_NORMAL, R.style.PDFTronAppTheme)
fragment.setDiffOptionsDialogListener { color1, color2, blendMode -> compareFiles(context, files, color1, color2, blendMode) }
fragment.show(fragmentManager, DiffOptionsDialogFragment.TAG)
}
```
{% endcode %}
{% endtab %}
{% endtabs %}
where `compareFile` is:
{% tabs %}
{% tab title="Java" %}
{% code lineNumbers="true" %}
```java
private final CompositeDisposable mDisposable = new CompositeDisposable();
private void compareFiles(Context context, ArrayList files, int color1, int color2, int blendMode) {
mDisposable.add(DiffUtils.compareFiles(context, files, color1, color2, blendMode)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer() {
@Override
public void accept(Uri uri) throws Exception {
// do something with the output
}
}, new Consumer() {
@Override
public void accept(Throwable throwable) throws Exception {
}
}));
}
```
{% endcode %}
{% endtab %}
{% tab title="Kotlin" %}
{% code lineNumbers="true" %}
```kotlin
private val mDisposable = CompositeDisposable()
private fun compareFiles(context: Context, files: ArrayList, color1: Int, color2: Int, blendMode: Int) {
mDisposable.add(DiffUtils.compareFiles(context, files, color1, color2, blendMode)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe({
// do something with the output
}, { }))
}
```
{% endcode %}
{% endtab %}
{% endtabs %}
`AsyncTask` pattern can be used instead of `Disposable` pattern if desired.
---
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