Android Utils (不定期更新)

2017

11-14

ToastUtils

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import android.content.Context;
import android.widget.Toast;

public class ToastUtils {

    // 是否需要显示 Toast,可以在 pplication 的 onCreate 函数里面初始化
    public static boolean isShow = true;

    /**
     * 短时间显示Toast
     * @param context
     * @param message
     */
    public static void showShort(Context context, String message) {
        if (isShow) Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 长时间显示Toast
     * @param context
     * @param message
     */
    public static void showLong(Context context, String message) {
        if (isShow) Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    }
}

LogUtils

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import android.util.Log;

/**
 * Log 统一管理类
 */
public class LogUtils {

    // 是否需要打印log,可以在 application 的 onCreate 函数里面初始化
    public static boolean isDebug = true;

    public static void i(String tag, String msg) {
        if (isDebug) Log.i(tag, msg);
    }

    public static void d(String tag, String msg) {
        if (isDebug) Log.d(tag, msg);
    }

    public static void e(String tag, String msg) {
        if (isDebug) Log.e(tag, msg);
    }

    public static void v(String tag, String msg) {
        if (isDebug) Log.v(tag, msg);
    }
}

ScreenUtils

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import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;

public class ScreenUtils {

    /**
     * 获得屏幕宽度
     * 
     * @param context
     * @return
     */
    public static int getScreenWidth(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获得屏幕高度
     * 
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    /**
     * 获得状态栏的高度
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context) {
        int statusHeight = -1;
        try {
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height").get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return statusHeight;
    }

    /**
     * 获取当前屏幕截图,包含状态栏
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;
    }

    /**
     * 获取当前屏幕截图,不包含状态栏
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithoutStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
        view.destroyDrawingCache();
        return bp;
    }
}

DensityUtils

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import android.content.Context;
import android.util.TypedValue;

public class DensityUtils {

    /**
     * dp转px
     * @param context
     * @param dpVal
     * @return
     */
    public static int dp2px(Context context, float dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, context.getResources().getDisplayMetrics());
    }

    /**
     * px转dp
     * @param context
     * @param pxVal
     * @return
     */
    public static float px2dp(Context context, float pxVal) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (pxVal / scale);
    }

    /**
     * sp转px
     * @param context
     * @param spVal
     * @return
     */
    public static int sp2px(Context context, float spVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                spVal, context.getResources().getDisplayMetrics());
    }

    /**
     * px转sp
     * @param context
     * @param pxVal
     * @return
     */
    public static float px2sp(Context context, float pxVal) {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }
}