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)
最佳答案
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)。
关于java - Android 应用程序在模拟器上运行，在手机上崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19683921/