AndroidStudio模板工程（三）

一、Fullscreen Activity

这个模板工程创建完成之后，工程内部包含一个MainActivity.java。运行截图如下所示：

                       

MainActivity的布局文件代码如下所示：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:background="#0099cc"
    tools:context=".FullscreenActivity">

    <!-- The primary full-screen view. This can be replaced with whatever view
         is needed to present your content, e.g. VideoView, SurfaceView,
         TextureView, etc. -->
    <TextView
        android:id="@+id/fullscreen_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:keepScreenOn="true"
        android:text="@string/dummy_content"
        android:textColor="#33b5e5"
        android:textSize="50sp"
        android:textStyle="bold" />

    <!-- This FrameLayout insets its children based on system windows using
         android:fitsSystemWindows. -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">
        <!--底部按钮-->
        <LinearLayout
            android:id="@+id/fullscreen_content_controls"
            style="?metaButtonBarStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal"
            android:background="@color/black_overlay"
            android:orientation="horizontal"
            tools:ignore="UselessParent">

            <Button
                android:id="@+id/dummy_button"
                style="?metaButtonBarButtonStyle"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/dummy_button" />

        </LinearLayout>
    </FrameLayout>

</FrameLayout>

MainActivity.java的源码如下：

package org.chromium.chrome.browser.androidstudio5demo;

import android.annotation.SuppressLint;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;

/**
 * An example full-screen activity that shows and hides the system UI (i.e.
 * status bar and navigation/system bar) with user interaction.
 */
public class FullscreenActivity extends AppCompatActivity {
    /**
     * Whether or not the system UI should be auto-hidden after
     * {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
     * 是否自动隐藏
     */
    private static final boolean AUTO_HIDE = true;

    /**
     * If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
     * user interaction before hiding the system UI.
     * 自动隐藏的延迟时间
     */
    private static final int AUTO_HIDE_DELAY_MILLIS = 3000;

    /**
     * Some older devices needs a small delay between UI widget updates
     * and a change of the status and navigation bar.
     * 为了兼容一些老设备
     */
    private static final int UI_ANIMATION_DELAY = 300;
    /**
     * 创建Handler
     */
    private final Handler mHideHandler = new Handler();
    private View mContentView;
    private final Runnable mHidePart2Runnable = new Runnable() {
        @SuppressLint("InlinedApi")
        @Override
        public void run() {
            // Delayed removal of status and navigation bar
            // 延迟状态栏和导航栏的移除
            // Note that some of these constants are new as of API 16 (Jelly Bean)
            // and API 19 (KitKat). It is safe to use them, as they are inlined
            // at compile-time and do nothing on earlier devices.
            mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
                    | View.SYSTEM_UI_FLAG_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        }
    };
    private View mControlsView;
    /**
     * 任务接口：用于控制ActionBar和页面底部控件的显示
     */
    private final Runnable mShowPart2Runnable = new Runnable() {
        @Override
        public void run() {
            // Delayed display of UI elements
            ActionBar actionBar = getSupportActionBar();
            if (actionBar != null) {
                actionBar.show();
            }
            mControlsView.setVisibility(View.VISIBLE);
        }
    };
    /**
     * 是否可视
     */
    private boolean mVisible;
    /**
     * 任务接口：用于控制ActionBar和页面底部控件的隐藏
     */
    private final Runnable mHideRunnable = new Runnable() {
        @Override
        public void run() {
            hide();
        }
    };
    /**
     * Touch listener to use for in-layout UI controls to delay hiding the
     * system UI. This is to prevent the jarring behavior of controls going away
     * while interacting with activity UI.
     * 底部控件的触摸监听
     */
    private final View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            if (AUTO_HIDE) {
                delayedHide(AUTO_HIDE_DELAY_MILLIS);
            }
            return false;
        }
    };

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

        setContentView(R.layout.activity_fullscreen);

        mVisible = true;
        //底部控制控件
        mControlsView = findViewById(R.id.fullscreen_content_controls);
        //内容控制控件
        mContentView = findViewById(R.id.fullscreen_content);


        // Set up the user interaction to manually show or hide the system UI.
        mContentView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toggle();
            }
        });

        // Upon interacting with UI controls, delay any scheduled hide()
        // operations to prevent the jarring behavior of controls going away
        // while interacting with the UI.
        findViewById(R.id.dummy_button).setOnTouchListener(mDelayHideTouchListener);
    }

    /**
     * 当Activity启动完成的时候调用，在此处可以做一些Splash页做的逻辑
     * @param savedInstanceState
     */
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);

        // Trigger the initial hide() shortly after the activity has been
        // created, to briefly hint to the user that UI controls
        // are available.
        delayedHide(100);
    }

    private void toggle() {
        if (mVisible) {
            hide();
        } else {
            show();
        }
    }

    /**
     * 隐藏控件
     */
    private void hide() {
        // Hide UI first 隐藏头标题
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.hide();
        }
        //隐藏底部控件
        mControlsView.setVisibility(View.GONE);
        mVisible = false;

        // Schedule a runnable to remove the status and navigation bar after a delay
        // 移除显示任务
        mHideHandler.removeCallbacks(mShowPart2Runnable);
        // 延迟隐藏任务
        mHideHandler.postDelayed(mHidePart2Runnable, UI_ANIMATION_DELAY);
    }

    @SuppressLint("InlinedApi")
    private void show() {
        // Show the system bar
        mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
        mVisible = true;

        // Schedule a runnable to display UI elements after a delay
        // 移除隐藏任务
        mHideHandler.removeCallbacks(mHidePart2Runnable);
        // 延迟隐藏任务
        mHideHandler.postDelayed(mShowPart2Runnable, UI_ANIMATION_DELAY);
    }

    /**
     * Schedules a call to hide() in delay milliseconds, canceling any
     * previously scheduled calls.
     */
    private void delayedHide(int delayMillis) {
        //移除之前的隐藏任务
        mHideHandler.removeCallbacks(mHideRunnable);
        //添加新的隐藏任务
        mHideHandler.postDelayed(mHideRunnable, delayMillis);
    }
}

二、Google AdMob Ads Activity

这个模板工程创建完成之后，工程内部包含一个MainActivity.java。运行截图如下所示：

                       

MainActivity的布局文件代码如下所示：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity">

    <!-- view for AdMob Interstitial Ad -->
    <TextView
        android:id="@+id/app_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="@string/interstitial_ad_sample"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/level"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/app_title"
        android:layout_centerHorizontal="true"
        android:text="@string/start_level"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/next_level_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/next_level" />
</RelativeLayout>

MainActivity.java的源码如下：

package org.chromium.chrome.browser.androidstudio6demo;

import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    // Remove the below line after defining your own ad unit ID.
    private static final String TOAST_TEXT = "Test ads are being shown. "
            + "To show live ads, replace the ad unit ID in res/values/strings.xml with your own ad unit ID.";

    private static final int START_LEVEL = 1;
    private int mLevel;
    private Button mNextLevelButton;
    private InterstitialAd mInterstitialAd;
    private TextView mLevelTextView;

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

        // Create the next level button, which tries to show an interstitial when clicked.
        mNextLevelButton = ((Button) findViewById(R.id.next_level_button));
        mNextLevelButton.setEnabled(false);
        mNextLevelButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showInterstitial();
            }
        });

        // Create the text view to show the level number.
        mLevelTextView = (TextView) findViewById(R.id.level);
        mLevel = START_LEVEL;

        // Create the InterstitialAd and set the adUnitId (defined in values/strings.xml).
        mInterstitialAd = newInterstitialAd();
        loadInterstitial();

        // Toasts the test ad message on the screen. Remove this after defining your own ad unit ID.
        Toast.makeText(this, TOAST_TEXT, Toast.LENGTH_LONG).show();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    /**
     * 创建新的间隙广告对象
     * @return
     */
    private InterstitialAd newInterstitialAd() {
        InterstitialAd interstitialAd = new InterstitialAd(this);
        interstitialAd.setAdUnitId(getString(R.string.interstitial_ad_unit_id));
        interstitialAd.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                //广告加载完成，激活mNextLevelButton
                mNextLevelButton.setEnabled(true);
            }

            @Override
            public void onAdFailedToLoad(int errorCode) {
                //广告加载完成，激活mNextLevelButton
                mNextLevelButton.setEnabled(true);
            }

            @Override
            public void onAdClosed() {
                // Proceed to the next level.
                //广告关闭的时候调用
                goToNextLevel();
            }
        });
        return interstitialAd;
    }

    /**
     * 显示间隙广告
     */
    private void showInterstitial() {
        // Show the ad if it's ready. Otherwise toast and reload the ad.
        if (mInterstitialAd != null && mInterstitialAd.isLoaded()) {
            mInterstitialAd.show();
        } else {
            Toast.makeText(this, "Ad did not load", Toast.LENGTH_SHORT).show();
            goToNextLevel();
        }
    }

    /**
     * 加载间隙广告
     */
    private void loadInterstitial() {
        // Disable the next level button and load the ad.
        mNextLevelButton.setEnabled(false);
        AdRequest adRequest = new AdRequest.Builder()
                .setRequestAgent("android_studio:ad_template").build();
        mInterstitialAd.loadAd(adRequest);
    }

    /**
     * 去下一级
     */
    private void goToNextLevel() {
        // Show the next level and reload the ad to prepare for the level after.
        mLevelTextView.setText("Level " + (++mLevel));
        mInterstitialAd = newInterstitialAd();
        loadInterstitial();
    }
}

因为国内的Android是不支持谷歌服务的，所以这个模板工程对平时开发作用不大。

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