Android项目总结

项目总结

最近在公司做了一个非常轻量级别的app,不过里面还是有一些知识点,是查了资料之后才会的,现在app基本做完了,整体总结一下。

1.获取当前app的一些基础信息:

public static final boolean DEBUG = BuildConfig.DEBUG;

//以下是能获取到的信息
public static final boolean DEBUG = Boolean.parseBoolean("true");
public static final String APPLICATION_ID = "com.fuyizhulao.daily_service";
public static final String BUILD_TYPE = "debug";
public static final String FLAVOR = "";
public static final int VERSION_CODE = 1;
public static final String VERSION_NAME = "1.0.0";

2.高德地图(具体用法见官网吧,文档很详细了)

3.个推(一个推送服务,很好用,同时它的别名机制也很人性化,省着后台再维护一套映射了)

4.Bugly(腾讯的一款崩溃统计,异常上报的SDK,非常好配置,非常的好用)

5.配置回调类的时候,可以配制成泛型的,非常的方便、灵活

public interface NetWorkListener {

    void onSuccess(T netWorkModel);

    void onFail(T netWorkModel);

}

6.在Fragment中想和Activity通信,可以通过EventBus进行通信,但是也不要过分依赖这个吧,因为当过分依赖之后,整个代码的逻辑会变得异常的复杂,同时发生异常之后,也是非常不好检查的。

7.在app中无论一个网络接口出现过几次,最好还是统一的封装起来会比较方便一点。

8.将Model专程Json字符串可以用Gson:

new Gson().toJson(new GetOrderList(
                        Integer.valueOf(MyApplication.id)
                        , state
                        , pageNum
                        , pageSize))

9.得到相机的View和控制闪光灯:

public class CameraView extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback {


    private Camera mCamera;

    private int mPreviewRotation = 90;
    private int mCamId = Camera.CameraInfo.CAMERA_FACING_BACK;
    private PreviewCallback mPrevCb;
    private byte[] mYuvPreviewFrame;
    private int previewWidth;
    private int previewHeight;

    private Camera.Parameters params;

    public interface PreviewCallback {
        void onGetYuvFrame(byte[] data);
    }

    public CameraView(Context context) {
        this(context, null);
    }

    public CameraView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setPreviewRotation(int rotation) {
        mPreviewRotation = rotation;
    }

    public void setCameraId(int id) {
        mCamId = id;
    }

    public int getCameraId() {
        return mCamId;
    }

    public void setPreviewCallback(PreviewCallback cb) {
        mPrevCb = cb;
        getHolder().addCallback(this);
    }

    public void setPreviewResolution(int width, int height) {
        previewWidth = width;
        previewHeight = height;
    }

    public boolean startCamera() {
        if (mCamera != null) {
            return false;
        }
        if (mCamId > (Camera.getNumberOfCameras() - 1) || mCamId < 0) {
            return false;
        }

        mCamera = Camera.open(mCamId);

        params = mCamera.getParameters();
        Camera.Size size = mCamera.new Size(previewWidth, previewHeight);

        mYuvPreviewFrame = new byte[previewWidth * previewHeight * 3 / 2];

        params.setPreviewSize(previewWidth, previewHeight);

        params.setPreviewFormat(ImageFormat.NV21);

        List supportedFocusModes = params.getSupportedFocusModes();

        if (!supportedFocusModes.isEmpty()) {
            if (supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
                params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
            }
        }

        mCamera.setParameters(params);

        mCamera.setDisplayOrientation(mPreviewRotation);

        mCamera.addCallbackBuffer(mYuvPreviewFrame);
        mCamera.setPreviewCallbackWithBuffer(this);
        try {
            mCamera.setPreviewDisplay(getHolder());
        } catch (IOException e) {
            e.printStackTrace();
        }
        mCamera.startPreview();

        return true;
    }

    public void stopCamera() {
        if (mCamera != null) {
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
            mCamera.release();
            mCamera = null;
        }
    }

    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        mPrevCb.onGetYuvFrame(data);
        camera.addCallbackBuffer(mYuvPreviewFrame);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceCreated(SurfaceHolder arg0) {
        if (mCamera != null) {
            try {
                mCamera.setPreviewDisplay(getHolder());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder arg0) {
    }

    public void isOpenLight(boolean isOpen) {
        if (isOpen) {
            params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            mCamera.setParameters(params);
        } else {
            params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
            mCamera.setParameters(params);
        }
    }

}

10.Notification

NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
mBuilder.setContentTitle(title)//设置通知栏标题
        .setContentIntent(getDefalutIntent(Notification.FLAG_AUTO_CANCEL)) //设置通知栏点击意图
        .setNumber(number) //设置通知集合的数量
        .setTicker(title) //通知首次出现在通知栏,带上升动画效果的
        .setWhen(System.currentTimeMillis())//通知产生的时间,会在通知信息里显示,一般是系统获取到的时间
        .setPriority(Notification.PRIORITY_DEFAULT) //设置该通知优先级
        .setAutoCancel(true)//设置这个标志当用户单击面板就可以让通知将自动取消
        .setOngoing(false)//ture,设置他为一个正在进行的通知。他们通常是用来表示一个后台任务,用户积极参与(如播放音乐)或以某种方式正在等待,因此占用设备(如一个文件下载,同步操作,主动网络连接)
        .setDefaults(Notification.DEFAULT_VIBRATE)//向通知添加声音、闪灯和振动效果的最简单、最一致的方式是使用当前的用户默认设置,使用defaults属性,可以组合
        //Notification.DEFAULT_ALL  Notification.DEFAULT_SOUND 添加声音 // requires VIBRATE permission
        .setSmallIcon(R.mipmap.ic_launcher);//设置通知小ICON
mNotificationManager.notify(1, mBuilder.build());

11.沉浸式状态栏

这是一个第三方库,用起来挺方便的,有空应该撸一遍它的源码

compile 'com.readystatesoftware.systembartint:systembartint:1.0.3'

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
//透明状态栏            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
//透明导航栏getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
SystemBarTintManager tintManager = new SystemBarTintManager(this);
// 激活状态栏
tintManager.setStatusBarTintEnabled(true);
// enable navigation bar tint 激活导航栏
//tintManager.setNavigationBarTintEnabled(true);
//设置系统栏设置颜色
//tintManager.setTintColor(R.color.red);
//给状态栏设置颜色
tintManager.setStatusBarTintResource(R.color.normal_blue);
//Apply the specified drawable or color resource to the system navigation bar.
//给导航栏设置资源
//tintManager.setNavigationBarTintResource(R.color.normal_blue);
}
android:fitsSystemWindows="true"
android:clipToPadding="true"

12.利用反射动态调节tablayout的长度

public void setIndicator(TabLayout tabs, int leftDip, int rightDip) {
        Class tabLayout = tabs.getClass();
        Field tabStrip = null;
        try {
            tabStrip = tabLayout.getDeclaredField("mTabStrip");
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }

        tabStrip.setAccessible(true);
        LinearLayout llTab = null;
        try {
            llTab = (LinearLayout) tabStrip.get(tabs);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        int left = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, leftDip, Resources.getSystem().getDisplayMetrics());
        int right = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, rightDip, Resources.getSystem().getDisplayMetrics());

        for (int i = 0; i < llTab.getChildCount(); i++) {
            View child = llTab.getChildAt(i);
            child.setPadding(0, 0, 0, 0);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
            params.leftMargin = left;
            params.rightMargin = right;
            child.setLayoutParams(params);
            child.invalidate();
        }

    }

13.验证码倒计时

mTimeCount = new TimeCount(60000, 1000);
mTimeCount.start();
class TimeCount extends CountDownTimer {
        public TimeCount(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onFinish() {// 计时完毕
            mGetCode.setText("获取验证码");
            mGetCode.setClickable(true);
        }

        @Override
        public void onTick(long millisUntilFinished) {// 计时过程
            mGetCode.setClickable(false);//防止重复点击
            mGetCode.setText(String.valueOf(millisUntilFinished / 1000) + "秒后重发");
        }
    }

14.downloadManager工具类

public class DownloadUtils {

    private DownloadManager mDownloadManager;
    private Context mContext;
    private long downloadId;
    private String apkName;

    public DownloadUtils(Context context) {
        mContext = context;
    }

    public void download(String url, String name) {
        final String packageName = "com.android.providers.downloads";
        int state = mContext.getPackageManager().getApplicationEnabledSetting(packageName);
        //检测下载管理器是否被禁用
        if (state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED
                || state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER
                || state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED) {
            AlertDialog.Builder builder = new AlertDialog.Builder(mContext).setTitle("温馨提示").setMessage
                    ("系统下载管理器被禁止,需手动打开").setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                    try {
                        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                        intent.setData(Uri.parse("package:" + packageName));
                        mContext.startActivity(intent);
                    } catch (ActivityNotFoundException e) {
                        Intent intent = new Intent(Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);
                        mContext.startActivity(intent);
                    }
                }
            }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            builder.create().show();
        } else {
            //正常下载流程
            apkName = name;
            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
            request.setAllowedOverRoaming(false);

            //通知栏显示
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            request.setTitle("test");
            request.setDescription("正在下载中...");
            request.setVisibleInDownloadsUi(true);

            //设置下载的路径
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, apkName);

            //获取DownloadManager
            mDownloadManager = (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
            downloadId = mDownloadManager.enqueue(request);

            mContext.registerReceiver(mReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
        }
    }

    private BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            checkStatus();
        }
    };

    /**
     * 检查下载状态
     */
    private void checkStatus() {
        DownloadManager.Query query = new DownloadManager.Query();
        query.setFilterById(downloadId);
        Cursor cursor = mDownloadManager.query(query);
        if (cursor.moveToFirst()) {
            int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
            switch (status) {
                //下载暂停
                case DownloadManager.STATUS_PAUSED:
                    break;
                //下载延迟
                case DownloadManager.STATUS_PENDING:
                    break;
                //正在下载
                case DownloadManager.STATUS_RUNNING:
                    break;
                //下载完成
                case DownloadManager.STATUS_SUCCESSFUL:
                    installAPK();
                    break;
                //下载失败
                case DownloadManager.STATUS_FAILED:
                    Toast.makeText(mContext, "下载失败", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
        cursor.close();
    }

    /**
     * 7.0兼容
     */
    private void installAPK() {
        File apkFile =
                new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), apkName);
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Uri apkUri = FileProvider.getUriForFile(mContext, mContext.getPackageName() + ".provider", apkFile);
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
        }
        mContext.startActivity(intent);
    }
}

15.还有一些简单的工具类:

public class Util {

    /**
     * 将时间戳转换为时间
     */
    public static String stampToDate(String s) {
        String res;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        long lt = new Long(s);
        Date date = new Date(lt);
        res = simpleDateFormat.format(date);
        return res;
    }

    /**
     * 这个工具类是为了展示出首页那种持续的效果
     * 例如:12月21日 09:00 - 10:00
     */
    public static String stampAndDurationToDate(long serviceTime, long duration) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM月dd日 HH:mm");
        Date date = new Date(serviceTime);
        String myData = simpleDateFormat.format(date);
        Date date2 = new Date(serviceTime + duration * 60 * 1000);
        String myData2 = simpleDateFormat.format(date2);
        return myData + "-" + myData2.split(" ")[1];
    }


    /**
     * 这个工具类是为了将时间戳转换成订单上面的时间
     * 例如:2016-12-21 09:00-10:00
     */
    public static String stampAndDurationToDateForOrder(long serviceTime, long duration) {
        String date1 = stampToDate(String.valueOf(serviceTime));
        String date2 = stampToDate(String.valueOf(serviceTime + duration * 60 * 1000));
        return date1 + "-" + date2.split(" ")[1];
    }





    /**
     * bitmap转file
     */

    public static File saveBitmapFile(Bitmap bitmap) {
        File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/img.png");//将要保存图片的路径
        try {
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
            bos.flush();
            bos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return file;
    }

}

16.cardView的点击效果

android:foreground="@drawable/card_view_select"




     
     


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