java - Android 应用程序在模拟器上运行，在手机上崩溃

Question

我一直在努力让这个程序在我的手机上持续运行。它基本上允许用户通过按下按钮来拍照，然后通过触摸图片读取 RGB 值。我已经让它工作了大约两次，没有对代码进行任何更改，但大多数时候它“意外停止”并崩溃。我还没有让它连续两次工作。但是，相同的代码在模拟器中可以完美运行。在错误日志中，它表示将位图分配给 ImageView 时程序无法执行。我进行了检查，确保最低 SDK 和目标 SDK 与手机型号的 Android 软件相匹配。我使用的手机是摩托罗拉 Droid X。我们将不胜感激!日志猫也包含在下面。编辑:另请注意，如果我输入虚拟 RGB 值，程序不会崩溃。

SOURCE

package com.example.firstapp;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity { //1

    TextView pixelcord, rgbvals; 
    ImageView iv;
    Button btn;



    @Override
    public void onCreate(Bundle savedInstanceState) { //2

        /* GATHER THE INFORMATION FROM THE LAYOUT TO ORGANIZE APP*/
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /* SET ON CLICK LISTENER TO GET CLICK REPSONSE -- LAUNCH CAMERA AND TAKE PHOTO */
        /* SET VARIABLES FOR USE FROM EACH VIEW */
        iv = (ImageView) findViewById(R.id.imageView); /* USE IMAGE VIEW FIELD*/
        pixelcord = (TextView)findViewById(R.id.pixelcord); /* USE TEXT FIELD FOR PIXEL */
        rgbvals = (TextView)findViewById(R.id.rgbvals); /* USE TEXT FIELD FOR RGB VALUES*/
        btn = (Button) findViewById(R.id.takePhoto);

        /* SET INFORMATION OF WHAT TO DO UPON EACH CLIK*/
        iv.setOnTouchListener(imgSourceOnTouchListener);

/* =====================================CAMERA BUTTON=====================================*/        
        btn.setOnClickListener(new OnClickListener() { //3

            @Override

            public void onClick(View v) { //4

                Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent, 0);

            } //*4


        }); //*3
/* =======================================================================================*/        


        } /* END OF ON CREATE*/ //*2

    /* DECLARATION OF IMG TOUCH FUNCTION*/

    OnTouchListener imgSourceOnTouchListener = new OnTouchListener() { //5

        @Override

        public boolean onTouch(View view, MotionEvent event) { //6


            float eventX = event.getX();
            float eventY = event.getY();
            float[] eventXY = new float[] { eventX, eventY};

            Matrix invertMatrix = new Matrix(); 
            ((ImageView)view).getImageMatrix().invert(invertMatrix);

            invertMatrix.mapPoints(eventXY); 
            int x = Integer.valueOf((int)eventXY[0]); /* POTENTIALLY REDUNDANT*/
            int y = Integer.valueOf((int)eventXY[1]);

            /* CHECK TO MAKE SURE VALUES ARE WITHIN BITMAP RANGE*/


            /* SET TEXT FUNCTION TO THE FIELD USING SET TEXT METHOD*/
            pixelcord.setText("X:" + String.valueOf(eventX) + "/ Y:" + String.valueOf(eventY) ); 

            Bitmap bitmap = ((BitmapDrawable)iv.getDrawable()).getBitmap(); 
            int touchedRGB = bitmap.getPixel(x,y);

            rgbvals.setText("Color Value" + "#" + Integer.toHexString(touchedRGB));
            rgbvals.setTextColor(touchedRGB);

            return true;

        } //*6


    }; //*5

    @Override

    public void onActivityResult( int requestCode, int resultCode, Intent data)
    { //7
        if(requestCode == 0)
        { //8
            Bitmap theImage = (Bitmap) data.getExtras().get("data");
            iv.setImageBitmap(theImage);

        } //*8
    } //*7


} //*1      

XML

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.seniordesign"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="7" />

    <uses-feature android:name="android.hardware.camera"></uses-feature>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.seniordesign.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

布局 XML

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 
    android:orientation = "vertical">


    <Button
        android:id="@+id/takePhoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="Take Photo" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="22dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/pixelcord"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/takePhoto"
        android:layout_alignBottom="@+id/takePhoto"
        android:layout_alignRight="@+id/imageView"
        android:layout_marginRight="15dp"
        android:text="Pixel Coordinates:" />

    <TextView
        android:id="@+id/rgbvals"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/pixelcord"
        android:layout_below="@+id/takePhoto"
        android:text="RGB Values:" />

</RelativeLayout>

提前感谢您的帮助!

编辑:LOGCAT

2013-10-30 09:57:39.061 E 5001/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalArgumentException: x must be < bitmap.width()
    at android.graphics.Bitmap.checkPixelAccess(Bitmap.java:824)
    at android.graphics.Bitmap.getPixel(Bitmap.java:779)
    at com.example.seniordesign.MainActivity$1.onTouch(MainActivity.java:90)
    at android.view.View.dispatchTouchEvent(View.java:3881)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1919)
    at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1186)
    at android.app.Activity.dispatchTouchEvent(Activity.java:2142)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1903)
    at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
    at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:3806)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
    at dalvik.system.NativeStart.main(Native Method)

Answer 1

它崩溃是因为 x 的值大于图像的宽度。我猜是在这一点上:

int touchedRGB = bitmap.getPixel(x,y);

您在 View 中设置的图像不必与 View 本身大小相同。它可以更大或更小。您可以尝试的是获取 View 上按下的点的百分比，并使用该百分比来计算图像上的位置。

这样位置将与图像的位置相同。当然，如果图像被拉伸(stretch)。