Android Open Source - LocalStorage Main Activity

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License

The source code is released under:

BSD 3-Clause License Copyright (c) 2013, Ian Lake All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following cond...

Java Source Code

package com.ianhanniballake.localstorage;
//w ww.jav a  2s  .  com
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.DocumentsContract;
import android.provider.OpenableColumns;
import android.support.annotation.NonNull;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewSwitcher;

public class MainActivity extends ActionBarActivity {
    private static final int RC_OPEN_DOCUMENT = 1;
    private static final int RC_OPEN_DOCUMENT_TREE = 2;
    private static final String LAST_RETURNED_DOCUMENT_URI = "LAST_RETURNED_DOCUMENT_URI";
    private static final String LAST_RETURNED_DOCUMENT_TREE_URI = "LAST_RETURNED_DOCUMENT_TREE_URI";
    private TextView mReturnedName;
    private ImageView mReturnedImage;
    private ViewSwitcher mReturnedDetailsSwitcher;
    private TextView mReturnedChildren;
    private Uri mLastReturnedDocumentUri;
    private Uri mLastReturnedDocumentTreeUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button openAll = (Button) findViewById(R.id.open_all_files);
        openAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("*/*");
                startActivityForResult(intent, RC_OPEN_DOCUMENT);
            }
        });
        Button openImages = (Button) findViewById(R.id.open_images);
        openImages.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("image/*");
                startActivityForResult(intent, RC_OPEN_DOCUMENT);
            }
        });
        Button createFile = (Button) findViewById(R.id.create_file);
        createFile.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
                // Filter to only show results that can be "opened", such as
                // a file (as opposed to a list of contacts or timezones).
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                // Create a file with the requested MIME type.
                intent.setType("text/plain");
                intent.putExtra(Intent.EXTRA_TITLE, "test_file.txt");
                startActivityForResult(intent, RC_OPEN_DOCUMENT);
            }
        });
        Button openDirectory = (Button) findViewById(R.id.open_directory);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            openDirectory.setOnClickListener(new View.OnClickListener() {
                @TargetApi(Build.VERSION_CODES.LOLLIPOP)
                @Override
                public void onClick(final View v) {
                    Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
                    startActivityForResult(intent, RC_OPEN_DOCUMENT_TREE);
                }
            });
        } else {
            openDirectory.setVisibility(View.GONE);
        }
        mReturnedName = (TextView) findViewById(R.id.returned_name);
        mReturnedImage = (ImageView) findViewById(R.id.returned_image);
        mReturnedDetailsSwitcher = (ViewSwitcher) findViewById(R.id.returned_details_switcher);
        mReturnedChildren = (TextView) findViewById(R.id.returned_children);
        View bottomBanner = findViewById(R.id.bottom_banner);
        if (bottomBanner instanceof Button) {
            bottomBanner.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(final View v) {
                    startActivity(new Intent(MainActivity.this, DonateActivity.class));
                }
            });
        }
    }

    @Override
    protected void onRestoreInstanceState(@NonNull final Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mLastReturnedDocumentUri = savedInstanceState.getParcelable(LAST_RETURNED_DOCUMENT_URI);
        mLastReturnedDocumentTreeUri = savedInstanceState.getParcelable(LAST_RETURNED_DOCUMENT_TREE_URI);
        if (mLastReturnedDocumentUri != null) {
            handleOpenDocument(mLastReturnedDocumentUri);
        } else if (mLastReturnedDocumentTreeUri != null) {
            handleOpenDocumentTree(mLastReturnedDocumentTreeUri);
        }
    }

    @Override
    protected void onSaveInstanceState(final Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelable(LAST_RETURNED_DOCUMENT_URI, mLastReturnedDocumentUri);
        outState.putParcelable(LAST_RETURNED_DOCUMENT_TREE_URI, mLastReturnedDocumentTreeUri);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_donate:
                startActivity(new Intent(this, DonateActivity.class));
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != Activity.RESULT_OK || data == null || data.getData() == null) {
            mReturnedName.setText("");
            mReturnedImage.setImageURI(null);
            return;
        }
        if (requestCode == RC_OPEN_DOCUMENT) {
            handleOpenDocument(data.getData());
        } else if (requestCode == RC_OPEN_DOCUMENT_TREE) {
            handleOpenDocumentTree(data.getData());
        }
    }

    private void handleOpenDocument(Uri documentUri) {
        mReturnedDetailsSwitcher.setDisplayedChild(0);
        Cursor cursor = getContentResolver().query(documentUri, null, null, null, null);
        try {
            // moveToFirst() returns false if the cursor has 0 rows.  Very handy for
            // "if there's anything to look at, look at it" conditionals.
            if (cursor != null && cursor.moveToFirst()) {
                // Note it's called "Display Name".  This is
                // provider-specific, and might not necessarily be the file name.
                String displayName = cursor.getString(
                        cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
                mReturnedName.setText(displayName);
                mReturnedImage.setImageURI(documentUri);
                mReturnedImage.setContentDescription(displayName);
                mLastReturnedDocumentUri = documentUri;
                mLastReturnedDocumentTreeUri = null;
            } else {
                mReturnedName.setText("");
                mReturnedImage.setImageURI(null);
                mReturnedImage.setContentDescription("");
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void handleOpenDocumentTree(Uri treeUri) {
        String parentDocumentId = DocumentsContract.getTreeDocumentId(treeUri);
        Uri parentDocumentUri = DocumentsContract.buildDocumentUri(LocalStorageProvider.AUTHORITY, parentDocumentId);
        String parentDisplayName = parentDocumentId;
        Cursor cursor = getContentResolver().query(parentDocumentUri, null, null, null, null);
        try {
            // moveToFirst() returns false if the cursor has 0 rows.  Very handy for
            // "if there's anything to look at, look at it" conditionals.
            if (cursor != null && cursor.moveToFirst()) {
                // Note it's called "Display Name".  This is
                // provider-specific, and might not necessarily be the file name.
                parentDisplayName = cursor.getString(
                        cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
                mLastReturnedDocumentUri = null;
                mLastReturnedDocumentTreeUri = treeUri;
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        mReturnedDetailsSwitcher.setDisplayedChild(1);
        Uri documentUri = DocumentsContract.buildChildDocumentsUriUsingTree(treeUri, parentDocumentId);
        cursor = getContentResolver().query(documentUri, null, null, null, null);
        if (cursor == null) {
            mReturnedName.setText("");
            mReturnedChildren.setText("");
            return;
        }
        mReturnedName.setText(getString(R.string.parent_document_title, cursor.getCount(), parentDisplayName));
        StringBuilder children = new StringBuilder();
        while (cursor.moveToNext()) {
            // Note it's called "Display Name".  This is
            // provider-specific, and might not necessarily be the file name.
            String displayName = cursor.getString(
                    cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
            children.append(displayName);
            if (!cursor.isLast()) {
                children.append('\n');
            }
        }
        mReturnedChildren.setText(children);
        cursor.close();
    }
}

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