我有一个列表视图,显示来自我的数据库的不同数据。这很完美。但是我的列表中只能有 3 个项目,因为我在加载完整图像后内存不足。这是我现在正在工作的代码,但是当列表中超过三个列表项时,内存不足。
String[] from = new String[] { "NAME", "DATE", "WEIGHT", "IMAGE_PATH"};
int[] to = new int[] { R.id.name, R.id.date, R.id.weight, R.id.list_image};
contactAdapter = new SimpleCursorAdapter(
Mylistview.this, R.layout.list_row, null, from, to);
setListAdapter(contactAdapter);
我想要做的是将图像缩小到 72x72,然后再将它们加载到列表中。下面是一个没有按我想要的方式工作的代码,但它让你知道我想要什么:)
list_image = (ImageView) findViewById(R.id.list_image);
String[] from = new String[] { "NAME", "DATE", "WEIGHT", "IMAGE_PATH"};
int[] to = new int[] { R.id.name, R.id.date, R.id.weight};
contactAdapter = new SimpleCursorAdapter(
Mylistview.this, R.layout.list_row, null, from, to);
setListAdapter(contactAdapter);
String icon = "IMAGE_PATH"
Bitmap bmp = BitmapFactory.decodeStream(icon);
Bitmap bm = Bitmap.createScaledBitmap(bmp, 72, 72, false);
list_image.setImageBitmap(bm);
我希望字符串图标从字符串数组中的数据库加载的“IMAGE_PATH”获取图像路径。
有没有办法做到这一点,还是我需要找到其他方法来用图像和小图标填充我的列表视图?也许当我拍照时,我应该将图像保存在两个地方。一张真实的图片和一个图标,并将图标路径放入数据库?
谢谢你
这是执行 Vishva Patel 帮助后的代码和错误代码。
BitmapScaler scaler = null;
try {
scaler = new BitmapScaler(new File("IMAGE_PATH"), 72);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
list_image.setImageBitmap(scaler.getScaled());
08-08 22:23:15.973: E/AndroidRuntime(2947): FATAL EXCEPTION: main
08-08 22:23:15.973: E/AndroidRuntime(2947): java.lang.RuntimeException: Unable to start activity ComponentInfo{se.xflash.myapp/se.xflash.myapp.myapp}: java.lang.RuntimeException: Unable to start activity ComponentInfo{se.xflash.myapp/se.xflash.myapp.MyNames}: java.lang.NullPointerException
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.access$600(ActivityThread.java:127)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.os.Looper.loop(Looper.java:137)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.main(ActivityThread.java:4507)
08-08 22:23:15.973: E/AndroidRuntime(2947): at java.lang.reflect.Method.invokeNative(Native Method)
08-08 22:23:15.973: E/AndroidRuntime(2947): at java.lang.reflect.Method.invoke(Method.java:511)
08-08 22:23:15.973: E/AndroidRuntime(2947): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
08-08 22:23:15.973: E/AndroidRuntime(2947): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
08-08 22:23:15.973: E/AndroidRuntime(2947): at dalvik.system.NativeStart.main(Native Method)
08-08 22:23:15.973: E/AndroidRuntime(2947): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{se.xflash.myapp/se.xflash.myapp.MyNames}: java.lang.NullPointerException
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1809)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.widget.TabHost.setCurrentTab(TabHost.java:346)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.widget.TabHost.addTab(TabHost.java:236)
08-08 22:23:15.973: E/AndroidRuntime(2947): at se.xflash.myapp.myapp.onCreate(myapp.java:45)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.Activity.performCreate(Activity.java:4465)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
08-08 22:23:15.973: E/AndroidRuntime(2947): ... 11 more
08-08 22:23:15.973: E/AndroidRuntime(2947): Caused by: java.lang.NullPointerException
08-08 22:23:15.973: E/AndroidRuntime(2947): at se.xflash.myapp.BitmapScaler.<init>(BitmapScaler.java:42)
08-08 22:23:15.973: E/AndroidRuntime(2947): at se.xflash.myapp.MyNames.onCreate(MyNames.java:56)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.Activity.performCreate(Activity.java:4465)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
08-08 22:23:15.973: E/AndroidRuntime(2947): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
08-08 22:23:15.973: E/AndroidRuntime(2947): ... 21 more