安卓开发小程序之美图秀秀

今天调试了一个慕课网上的小程序，功能是通过HSI 来调整图像的色调，饱和度，亮度。一开始虚拟机出现App has stopped  后面经过调试 app成功运行 出现Bug的原因是没有创建

setContentView(R.layout.primary_color);

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.meituxiuxiu"> 

package com.androidzhangting.meituxiuxiu;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;

public class ImageHelper {
    public static Bitmap handleImageEffect(Bitmap bm,float hue,float saturation,float lum){
        Bitmap bmp=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),Bitmap.Config.ARGB_8888);
        Canvas canvas=new Canvas(bmp);
        Paint paint=new Paint(Paint.ANTI_ALIAS_FLAG);

        ColorMatrix hueMatrix=new ColorMatrix();
        hueMatrix.setRotate(0,hue);
        hueMatrix.setRotate(1,hue);
        hueMatrix.setRotate(2,hue);

        ColorMatrix  saturationMatrix=new ColorMatrix();
        saturationMatrix.setSaturation(saturation);

        ColorMatrix lumMatrix=new ColorMatrix();
        lumMatrix.setScale(lum,lum,lum,1);

        ColorMatrix imageMatrix=new ColorMatrix();
        imageMatrix.postConcat(hueMatrix);
        imageMatrix.postConcat(saturationMatrix);
        imageMatrix.postConcat(lumMatrix);

        paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix));
        canvas.drawBitmap(bm,0,0,paint);




        return bmp;
    }
}

package com.androidzhangting.meituxiuxiu;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.widget.ImageView;
import android.widget.SeekBar;

public class PrimaryColor extends Activity implements SeekBar.OnSeekBarChangeListener {
    private ImageView mimageView;
    private SeekBar mSeekbarHue, mSeekbarSaturation, mSeekbarLum;
    private static int MAX_VALUE = 255;
    private static int MID_VALUE = 127;
    private float mHue, mSaturation, mLum;

    private Bitmap bitmap;



    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.primary_color);
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pubu);
        mimageView = (ImageView) findViewById(R.id.imageview);
        mSeekbarHue = (SeekBar) findViewById(R.id.seekbarHue);
        mSeekbarSaturation = (SeekBar) findViewById(R.id.seekbarSaturation);
        mSeekbarLum = (SeekBar) findViewById(R.id.seekbarLum);
        mSeekbarHue.setOnSeekBarChangeListener(this);
        mSeekbarSaturation.setOnSeekBarChangeListener(this);
        mSeekbarLum.setOnSeekBarChangeListener(this);
        mSeekbarHue.setMax(MAX_VALUE);
        mSeekbarSaturation.setMax(MAX_VALUE);
        mSeekbarLum.setMax(MAX_VALUE);
        mSeekbarHue.setProgress(MID_VALUE);
        mSeekbarSaturation.setProgress(MID_VALUE);
        mSeekbarLum.setProgress(MID_VALUE);
        mimageView.setImageBitmap(bitmap);


    }




    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        switch (seekBar.getId()) {
            case R.id.seekbarHue:
                mHue = (progress - MID_VALUE) * 1.0f / MID_VALUE * 180;
                break;
            case R.id.seekbarSaturation:
                mSaturation = progress * 1.0f / MID_VALUE;
                break;
            case R.id.seekbarLum:
                mLum = progress * 1.0f / MID_VALUE;
                break;

        }
        mimageView.setImageBitmap(ImageHelper.handleImageEffect(bitmap, mHue, mSaturation, mLum));


    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:paddingBottom="16dp"
    android:paddingTop="16dp"
    android:paddingRight="16dp"
    android:paddingLeft="16dp"
    tools:context=".MeiTuXiuXiuActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="40dp"
        android:text="美图秀秀"
        android:textSize="40sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.502"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.146" />

    <Button
        android:id="@+id/buttonhue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="PrimaryColor"
        android:onClick="btnPrimaryColor"
        tools:layout_editor_absoluteX="148dp"
        tools:layout_editor_absoluteY="184dp" />

    <Button
        android:id="@+id/buttonsaturation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="NewButton"
        tools:layout_editor_absoluteX="148dp"
        tools:layout_editor_absoluteY="280dp" />

    <Button
        android:id="@+id/buttonlum"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="NewButton"
        tools:layout_editor_absoluteX="128dp"
        tools:layout_editor_absoluteY="382dp" />

</LinearLayout>

<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MeiTuXiuXiuActivity">

package com.androidzhangting.meituxiuxiu;

import android.app.Activity;
import android.content.Intent;

import android.os.Bundle;
import android.view.View;

public class MeiTuXiuXiuActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mei_tu_xiu_xiu);
    }
    public  void btnPrimaryColor(View view){
        startActivity(new Intent(this,PrimaryColor.class));
    }



}

<intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".PrimaryColor"/> </application></manifest>