AbsoluteLayout xiantu

xiantu.java

public class xiantu extends Activity
{
  /*声明对象变量*/
  private ImageView mImageView;
  private Button mButton;
  private TextView mTextView;
  private String fileName="/data/data/irdc.ex04_22/ex04_22_2.png";
  
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    /* 载入main.xml Layout */
    setContentView(R.layout.main);
    
    /* 取得Button对象，并添加onClickListener */
    mButton = (Button)findViewById(R.id.mButton);
    mButton.setOnClickListener(new Button.OnClickListener()
    {
      public void onClick(View v)
      {
      /* 取得对象 */
        mImageView = (ImageView)findViewById(R.id.mImageView);
        mTextView=(TextView)findViewById(R.id.mTextView);
        /* 检查文件是否存在 */
        File f=new File(fileName);   
        if(f.exists()) 
        { 
          /* 产生Bitmap对象，并放入mImageView中 */
          Bitmap bm = BitmapFactory.decodeFile(fileName);
          mImageView.setImageBitmap(bm);
          mTextView.setText(fileName); 
        } 
        else 
        {  
          mTextView.setText("此文件不存在"); 
        }
      } 
    });
  }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
  <AbsoluteLayout
    android:id="@+id/layout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/white"
    xmlns:android="http://schemas.android.com/apk/res/android"
  >
    <TextView 
      android:id="@+id/mTextView" 
      android:layout_width="fill_parent"  
      android:layout_height="wrap_content"  
      android:text="@string/str_text"
      android:layout_x="30px"
      android:layout_y="30px"
      android:textColor="@drawable/blue"
    >
    </TextView> 
    <ImageView
      android:id="@+id/mImageView"
      android:layout_width="250px"
      android:layout_height="188px"
      android:src="@drawable/example060"
      android:layout_x="30px"
      android:layout_y="62px"
    >
    </ImageView>
    <Button
      android:id="@+id/mButton"
      android:layout_width="155px"
      android:layout_height="wrap_content"
      android:text="@string/str_button"
      android:textSize="18sp"
      android:layout_x="80px"
      android:layout_y="302px"
    >
    </Button>
  </AbsoluteLayout>