标签：android blog http os ar cti div 代码
http://blog.sina.com.cn/s/blog_474928c90100x871.html
public class Ex04_1Activity extends Activity {
EditText editText;
TextView textView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
editText = (EditText) findViewById(R.id.myEditText);
textView = (TextView) findViewById(R.id.myTextView);
editText.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
textView.setText(editText.getText());
Toast toast = new Toast(Ex04_1Activity.this);
toast.setView(textView);//错误1
toast.show();
错误1的地方会报view not attached to windows manager的错误。根据错误提示，将代码改为如下就可行了：
@Override
public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
textView.setText(editText.getText());
Toast toast = new Toast(Ex04_1Activity.this);
TextView textView1 = new TextView(Ex04_1Activity.this);
textView1.setText(textView.getText());
toast.setView(textView1);
toast.show();
由此分析，以findViewById形式生成的View，new Toast()这种方式是拿不到的，因为初始程序还会报告一个FindViewLocked的错误。
为了进一步证明我的猜想，将代码改成如下形式：
public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
textView.setText(editText.getText());
Toast.makeText(Ex04_1Activity.this, editText.getText(), 1).show();
return false;
}
程序又一次通过了。
再次改一下代码：
public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
textView.setText(editText.getText());
Toast toast = new Toast(Ex04_1Activity.this);
toast.setText(editText.getText().toString());
toast.show();
return false;
}
这时又报了一个：This Toast was not created with Toast.makeText()的错误。
由此可见，Toast.makeText()生成的Toast可以访问findViewById方式生成的View，而自己New Toast()的方式生成的Toast只能访问同样new 出来的View对象。原因大概是在.xml中生成的View对象可以被多个Activity引用，Android为了安全起见，就将其上了锁，并且提供唯一的Toast方式，Toast.makeText()来实现吐丝，这一点和单例模式颇有共同之处
view not attached to windows manager与This Toast was not created with Toast.makeText(),布布扣,bubuko.com
view not attached to windows manager与This Toast was not created with Toast.makeText()
标签：android blog http os ar cti div 代码
原文地址：http://www.cnblogs.com/qufanblog/p/3921524.html
