android - FindViewById 其中 ID 是动态字符串

Question

我有一张有 40 个方格的 table ，每个方格都有一个 ID。当我从另一个 Activity 传递 Bundle 时，我需要从该 bundle 中提取 Note、Color 和 ID。然后应用程序将更改/添加文本并更改由提取的 ID 指定的正方形的背景。每个方 block 都有 int 格式的 ID。从其他 Activity 传递的每个 ID 都是字符串格式。我不知道如何找到 findViewById(R.id.passed_id)，以及如何让两种不同的格式一起工作。我试图更改每个方 block 的 ID，但 eclipse 说 ID 必须有一个字母和一个数字。我迷路了....这是代码:

package com.tt;

 import android.os.Bundle;
 import android.app.Activity;
 import android.content.Intent;
import android.content.res.Resources;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity
 {
String gotNotes;
String n;
String gotDOW;
String gotID;
public String Id;
String gotHour;
TextView notes;
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initialize();
    Button settings = (Button)findViewById(R.id.settings);

    Bundle gotPackage = getIntent().getExtras();
    if (gotPackage != null){
    gotNotes = gotPackage.getString("AddedNote");
   // if (gotNotes.equals(" ")){n = "Empty";}else n = gotNotes;
    //gotDOW = gotPackage.getString("Day");
    //gotHour = gotPackage.getInt("Hour");
    gotID = gotPackage.getString("ID");

    Id = gotID;
    notes.setText(gotNotes + (" \n") + gotID);

    }
    else{}



  settings.setOnClickListener(new OnClickListener()
    {



          public void onClick(View v)
         {
              Intent i = new Intent(v.getContext(),Settings.class);
              startActivityForResult(i,0);
         }

     });

   }

  private void initialize() 
       {
    // TODO Auto-generated method stub


    notes = (TextView)findViewById(R.id.);
    notes.setGravity(Gravity.CENTER);
    notes.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12);
}



    @Override
            public boolean onCreateOptionsMenu(Menu menu) 
             {
               getMenuInflater().inflate(R.menu.activity_main, menu);
               return true;

             }

      }

更新

Ok.. here's the log:

12-27 16:18:55.661: D/AndroidRuntime(12497): Shutting down VM
12-27 16:18:55.661: W/dalvikvm(12497): threadid=1: thread exiting with uncaught exception (group=0x40abf228)
12-27 16:18:55.671: E/AndroidRuntime(12497): FATAL EXCEPTION: main
12-27 16:18:55.671: E/AndroidRuntime(12497): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tt/com.tt.MainActivity}: java.lang.NullPointerException
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2194)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2229)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread.access$600(ActivityThread.java:139)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.os.Looper.loop(Looper.java:154)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread.main(ActivityThread.java:4944)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at java.lang.reflect.Method.invokeNative(Native Method)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at java.lang.reflect.Method.invoke(Method.java:511)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at dalvik.system.NativeStart.main(Native Method)
12-27 16:18:55.671: E/AndroidRuntime(12497): Caused by: java.lang.NullPointerException
12-27 16:18:55.671: E/AndroidRuntime(12497):    at com.tt.MainActivity.initialize(MainActivity.java:69)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at com.tt.MainActivity.onCreate(MainActivity.java:30)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.Activity.performCreate(Activity.java:4531)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
12-27 16:18:55.671: E/AndroidRuntime(12497):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2150)
12-27 16:18:55.671: E/AndroidRuntime(12497):    ... 11 more

Answer 1

您可以使用以下方法从字符串中获取标识符:

notes = (TextView)findViewById(getResources().getIdentifier(VIEW_NAME, "id", getPackageName()));

VIEW_NAME 是您生成的任何标识符字符串。之后，您可以像现在一样设置它的文本。如果您还需要获取字符串和可绘制对象，这也适用，只需将 id 更改为适当的类型即可。