com.nexuspad.common.activity.NPNavigateActivity.java Source code

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Here is the source code for com.nexuspad.common.activity.NPNavigateActivity.java

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/*
 * Copyright 2013 Edmond Chui
 *
 * 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.nexuspad.common.activity;

import android.app.ActionBar;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.MenuItem;
import com.nexuspad.common.annotation.ParentActivity;

/**
 * A class which simplifies the "up" button implementation.
 * <p>
 * If the subclass has a annotation, the "up" button will
 * behave as specified in the Android Design Guideline, which starts the parent
 * {@code Activity} with the correct {@code Intent} flags, and calls
 * {@link #finish()} on the current {@code Activity}.
 * <p>
 * Alternatively, you can pass in the parent {@code Activity} class as a
 * {@code Serializable} extra with the key {@link #KEY_PARENT_ACTIVITY}. This
 * will take precedence over the annotation.
 * <p>
 *
 * @author Edmond
 *
 */
public abstract class NPNavigateActivity extends FragmentActivity {
    /**
     * The key for passing a parent Activity with {@code Intent}.
     *
     * @see android.content.Intent#putExtra(String, java.io.Serializable)
     * @see android.os.Bundle#putSerializable(String, java.io.Serializable)
     */
    public static final String KEY_PARENT_ACTIVITY = "parent_activity";

    protected Class<?> mParentActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (mParentActivity == null) {
            mParentActivity = (Class<?>) getIntent().getSerializableExtra(KEY_PARENT_ACTIVITY);
        }

        if (mParentActivity == null) {
            ParentActivity upAnnotaion = getClass().getAnnotation(ParentActivity.class);
            if (upAnnotaion != null) {
                mParentActivity = upAnnotaion.value();
            }
        }

        if (mParentActivity != null) {
            ActionBar actionBar = getActionBar();
            if (actionBar != null) {
                actionBar.setDisplayHomeAsUpEnabled(true);
            }
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            if (mParentActivity != null) {
                startActivity(getGoBackIntent(mParentActivity));
                finish();
                return true;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * Subclasses may override this method to return a custom {@link android.content.Intent}.
     *
     * @param activity
     * @return
     *         a non-null {@code Activity} {@link android.content.Intent} which will be passed
     *         to {@link #startActivity(android.content.Intent)}.
     */
    protected Intent getGoBackIntent(Class<?> activity) {
        Intent intent = new Intent(this, activity);
        intent.addFlags(
                Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        return intent;
    }
}