Android中给Activity添加返回键

       
// this need android:minSdkVersion="11"
 getActionBar().setDisplayHomeAsUpEnabled(true);

   
 @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            finish();// finish your activity
        }
        return super.onOptionsItemSelected(item);
    }