Android开发常见错误小结

// back按钮 
Button btnBack = (Button) findViewById(R.id.btnActivity2Back);
btnBack.setOnClickListener(new OnClickListener() { 
  @Override 
  public void onClick(View v) { 
 Intent intent = new Intent(); 
 intent.putExtra("from", 2); 
 setResult(RESULT_OK, intent); 
 finish(); 
  } 
});

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    TextView tview = (TextView) findViewById(R.id.textViewResult1);
    if (data != null) { 
      tview.setText("从" + data.getStringExtra("from") + "返回!");
    } 
    super.onActivityResult(requestCode, resultCode, data); 
}

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:orientation="vertical" > 
  <Button 
    android:id="@+id/btnInitData5000" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="初始化数据5000条" /> 
  <Button 
    android:id="@+id/btnInitListView" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="读取数据初始化ListView" /> 
  <ListView 
    android:id="@+id/listView4" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 
  </ListView> 
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" > 
  <TextView 
    android:id="@+id/textViewItemName" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" /> 
</LinearLayout> 

startActivity(intent); 
// finish(); 
  Log.e("mason", "gongneng ani called"); 
  overridePendingTransition(R.anim.slide_out_right, 
   R.anim.slide_in_left);