Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License */ package com.android.tv.settings.device.storage; import android.app.Activity; import android.app.Fragment; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.os.Handler; import android.os.storage.StorageManager; import android.os.storage.VolumeInfo; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v17.leanback.app.GuidedStepFragment; import android.support.v17.leanback.widget.GuidanceStylist; import android.support.v17.leanback.widget.GuidedAction; import android.support.v4.content.LocalBroadcastManager; import android.text.TextUtils; import android.view.View; import android.widget.Toast; import com.android.tv.settings.R; import com.android.tv.settings.dialog.ProgressDialogFragment; import java.util.List; public class UnmountActivity extends Activity { private static final String TAG = "UnmountActivity"; public static final String EXTRA_VOLUME_DESC = "UnmountActivity.volumeDesc"; private String mUnmountVolumeId; private String mUnmountVolumeDesc; private final Handler mHandler = new Handler(); private final BroadcastReceiver mUnmountReceiver = new UnmountReceiver(); public static Intent getIntent(Context context, String volumeId, String volumeDesc) { final Intent i = new Intent(context, UnmountActivity.class); i.putExtra(VolumeInfo.EXTRA_VOLUME_ID, volumeId); i.putExtra(EXTRA_VOLUME_DESC, volumeDesc); return i; } @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mUnmountVolumeId = getIntent().getStringExtra(VolumeInfo.EXTRA_VOLUME_ID); mUnmountVolumeDesc = getIntent().getStringExtra(EXTRA_VOLUME_DESC); LocalBroadcastManager.getInstance(this).registerReceiver(mUnmountReceiver, new IntentFilter(SettingsStorageService.ACTION_UNMOUNT)); if (savedInstanceState == null) { final StorageManager storageManager = getSystemService(StorageManager.class); final VolumeInfo volumeInfo = storageManager.findVolumeById(mUnmountVolumeId); if (volumeInfo == null) { // Unmounted already, just bail finish(); return; } if (volumeInfo.getType() == VolumeInfo.TYPE_PRIVATE) { final Fragment fragment = UnmountPrivateStepFragment.newInstance(mUnmountVolumeId); getFragmentManager().beginTransaction().replace(android.R.id.content, fragment).commit(); } else { // Jump straight to unmounting onRequestUnmount(); } } } @Override protected void onDestroy() { super.onDestroy(); LocalBroadcastManager.getInstance(this).unregisterReceiver(mUnmountReceiver); } public void onRequestUnmount() { final Fragment fragment = UnmountProgressFragment.newInstance(mUnmountVolumeDesc); getFragmentManager().beginTransaction().replace(android.R.id.content, fragment).commit(); // Post this so that it will presumably run after onResume, if we're calling from onCreate() mHandler.post(new Runnable() { @Override public void run() { SettingsStorageService.unmount(UnmountActivity.this, mUnmountVolumeId); } }); } @Override protected void onResume() { super.onResume(); final VolumeInfo volumeInfo = getSystemService(StorageManager.class).findVolumeById(mUnmountVolumeId); if (volumeInfo == null) { // Unmounted already, just bail finish(); } } private class UnmountReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (TextUtils.equals(intent.getAction(), SettingsStorageService.ACTION_UNMOUNT) && TextUtils.equals(intent.getStringExtra(VolumeInfo.EXTRA_VOLUME_ID), mUnmountVolumeId)) { final Boolean success = intent.getBooleanExtra(SettingsStorageService.EXTRA_SUCCESS, false); if (success) { Toast.makeText(UnmountActivity.this, getString(R.string.storage_unmount_success, mUnmountVolumeDesc), Toast.LENGTH_SHORT) .show(); } else { Toast.makeText(UnmountActivity.this, getString(R.string.storage_unmount_failure, mUnmountVolumeDesc), Toast.LENGTH_SHORT) .show(); } finish(); } } } public static class UnmountPrivateStepFragment extends GuidedStepFragment { private static final int ACTION_ID_UNMOUNT = 1; public static UnmountPrivateStepFragment newInstance(String volumeId) { final UnmountPrivateStepFragment fragment = new UnmountPrivateStepFragment(); final Bundle b = new Bundle(1); b.putString(VolumeInfo.EXTRA_VOLUME_ID, volumeId); fragment.setArguments(b); return fragment; } @Override public @NonNull GuidanceStylist.Guidance onCreateGuidance(Bundle savedInstanceState) { return new GuidanceStylist.Guidance(getString(R.string.storage_wizard_eject_private_title), getString(R.string.storage_wizard_eject_private_description), "", getActivity().getDrawable(R.drawable.ic_storage_132dp)); } @Override public void onCreateActions(@NonNull List<GuidedAction> actions, Bundle savedInstanceState) { actions.add(new GuidedAction.Builder(getContext()).clickAction(GuidedAction.ACTION_ID_CANCEL).build()); actions.add(new GuidedAction.Builder(getContext()).id(ACTION_ID_UNMOUNT) .title(getString(R.string.storage_eject)).build()); } @Override public void onGuidedActionClicked(GuidedAction action) { final long id = action.getId(); if (id == GuidedAction.ACTION_ID_CANCEL) { getFragmentManager().popBackStack(); } else if (id == ACTION_ID_UNMOUNT) { ((UnmountActivity) getActivity()).onRequestUnmount(); } } } public static class UnmountProgressFragment extends ProgressDialogFragment { private static final String ARG_DESCRIPTION = "description"; public static UnmountProgressFragment newInstance(CharSequence description) { final Bundle b = new Bundle(1); b.putCharSequence(ARG_DESCRIPTION, description); final UnmountProgressFragment fragment = new UnmountProgressFragment(); fragment.setArguments(b); return fragment; } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); final CharSequence description = getArguments().getCharSequence(ARG_DESCRIPTION); setTitle(getActivity().getString(R.string.storage_wizard_eject_progress_title, description)); } } }