封装Activity基类，快速实现添加标题栏，设置状态栏样式

本篇博客是在网上学习快速封装一个ToolBar的基类的灵感，作了一定程度的衍生。
第一步:创建一个BaseActivity并在其布局文件中设定标题栏的样式，FrameLayout是用于装载子类Activity的布局。

<LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <RelativeLayout        android:id="@+id/topbar"        android:layout_width="match_parent"        android:layout_height="50dp"        android:background="@color/colorPrimary">        <ImageButton            android:scaleX="0.5"            android:scaleY="0.5"            android:id="@+id/left_btn"            android:layout_width="50dp"            android:layout_height="50dp"/>        <TextView            android:id="@+id/title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textColor="@color/white"            android:layout_centerInParent="true"            android:textSize="16sp"/>        <ImageButton            android:scaleX="0.5"            android:scaleY="0.5"            android:id="@+id/right_btn"            android:layout_width="50dp"            android:layout_height="50dp"            android:layout_alignParentRight="true"/>    </RelativeLayout>    <FrameLayout        android:id="@+id/viewContent"        android:layout_width="match_parent"        android:layout_height="match_parent"/></LinearLayout>

界面当中的整个标题栏、左右侧按钮、标题名称都是可自定义的。

第二步:使用抽象方法的方式从子类Activity中收参，完成子类Activity界面的装载以及相关事件的配置。

public abstract class TopbarBaseActivity extends Activity{    public static final int NO_STATUE_BAR = 0;    public static final int ALPHA_STATUE_BAR = 1;    public static final int NOMAL_STATUE_BAR = 2;    private TextView wTitle;    private RelativeLayout topBar;    private ImageButton wLeft_btn;    private ImageButton wRight_btn;    private FrameLayout viewContent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_baseactivity);        wTitle = (TextView) findViewById(R.id.title);        wLeft_btn = (ImageButton) findViewById(R.id.left_btn);        wRight_btn = (ImageButton) findViewById(R.id.right_btn);        viewContent = (FrameLayout) findViewById(R.id.viewContent);        topBar = (RelativeLayout) findViewById(R.id.topbar);        LayoutInflater.from(TopbarBaseActivity.this).inflate(getContentView(),viewContent);        init(savedInstanceState);    }    protected abstract int getContentView();    protected abstract void init(Bundle savedInstanceState);    //设置状态栏样式    protected void setStatueBar(int style){        switch (style){            case NO_STATUE_BAR:                try {                    if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {                        Window window = getWindow();                        window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);                    }                } catch (Exception e) {                    e.printStackTrace();                }                break;            case ALPHA_STATUE_BAR:                try {                    if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {                        Window window = getWindow();                        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);                    }                } catch (Exception e) {                    e.printStackTrace();                }                break;        }    }    //设置标题名称    protected void setTopTitle(String topName , boolean show){        if (show){            if (!TextUtils.isEmpty(topName)){                wTitle.setText(topName);            }        }else {            topBar.setVisibility(View.GONE);        }    }    //设置标题栏左侧的按钮    protected void setLeftBtn(boolean show , int ResId , View.OnClickListener leftClick){        if (show){            wLeft_btn.setBackgroundResource(ResId);            wLeft_btn.setOnClickListener(leftClick);        }else {            wLeft_btn.setVisibility(View.GONE);        }    }    //设置标题栏右侧的按钮    protected void setRightBtn(boolean show , int ResId , View.OnClickListener rightClick){        if (show){            wRight_btn.setBackgroundResource(ResId);            wRight_btn.setOnClickListener(rightClick);        }else {            wRight_btn.setVisibility(View.GONE);        }    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){            finish();            overridePendingTransition(R.anim.left_fadein,R.anim.left_fadeout);        }        return true;    }    @Override    public void startActivity(Intent intent) {        super.startActivity(intent);        overridePendingTransition(R.anim.right_fadein,R.anim.right_fadeout);    }}

第三步:子类Activity继承此基类。使用姿势是这样的

public class ActivityMain extends TopbarBaseActivity {    private Button cckk;    @Override    protected int getContentView() {        return R.layout.activity_main;    }    @Override    protected void init(Bundle savedInstanceState) {        setStatueBar(TopbarBaseActivity.NO_STATUE_BAR);        setTopTitle("主界面",false);        cckk = (Button) findViewById(R.id.zhu);        setLeftBtn(true, R.drawable.bbck, new View.OnClickListener() {            @Override            public void onClick(View v) {                OkToast.getInstance("左侧按钮的点击事件").show();            }        });        cckk.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                OkToast.getInstance("测试点击事件").show();            }        });        setRightBtn(false, R.drawable.menu, null);    }}

子类中可以配置标题栏的一系列属性，可以配置状态栏目的属性，核心思想是使用抽象方法完成回调的一个操作。