public class MainActivity extends Activity implements OnClickListener{
private TextView textView;
private ImageView imageView;
private int index;
private int images [] = {R.drawable.image1,R.drawable.image2,R.drawable.image3};
private MyRunnable runnable = new MyRunnable();
private Button button;
class Person{
public int age;
public String name;
@Override
public String toString() {
// TODO Auto-generated method stub
return "name=" + name + " age=" + age;
}
}
private Handler handler = new Handler(new Callback() {
@Override
public boolean handleMessage(Message msg) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"" + 1, 1).show();
return false;
}
}){
public void handleMessage(Message msg){
Toast.makeText(getApplicationContext(),"" + 2, 1).show();
}
};
class MyRunnable implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
index++;
index = index % 3;
imageView.setImageResource(images[index]);
handler.postDelayed(runnable, 1000);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView1);
textView = (TextView) findViewById(R.id.textview);
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(this);
new Thread(){
public void run() {
try {
Thread.sleep(2000);
Message message = handler.obtainMessage();
Person person = new Person();
person.age = 12;
person.name = "mike";
message.obj = person;
message.sendToTarget();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
}.start();
handler.postDelayed(runnable, 1000);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
handler.sendEmptyMessage(1);
}
}
按照学习视频打得，一模一样，还是报错。
private Handler handler = new Handler(new Callback() {
@Override
public boolean handleMessage(Message msg) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),"" + 1, 1).show();
return false;
}
}){
public void handleMessage(Message msg){
Toast.makeText(getApplicationContext(),"" + 2, 1).show();
}
};
搞不懂
problems报错信息：大概意思是handler没有这种定义的构造，第二个是handleMessage方法需要重写或实现。首先这个方法是视频上面大的，我是照葫芦画瓢。第二这个方法已经重写了，有Toast...
Description Resource Path Location Type
The constructor Handler(new Callback(){}) is undefined MainActivity.java /handler_01/src/com/hao123/handler_01 line 35 Java Problem
Description Resource Path Location Type
The method handleMessage(Message) of type new Callback(){} must override or implement a supertype method MainActivity.java /handler_01/src/com/hao123/handler_01 line 38 Java Problem
我试过如果改一下标点符号就报个标点符号的错误 ，例如把最后一排括回来的大括号和分号删除
Description Resource Path Location Type
Syntax error, insert ";" to complete FieldDeclaration MainActivity.java /handler_01/src/com/hao123/handler_01 line 121 Java Problem
Description Resource Path Location Type
Description Resource Path Location Type
Syntax error, insert "}" to complete ClassBody MainActivity.java /handler_01/src/com/hao123/handler_01 line 121 Java Problem
但是这种报错是那种坑爹的报错，明显那个地方是要标点的
