View:文本等都是View的子類
Activity_main.xml
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FF0000"
android:text="@string/hello_world"/>
</LinearLayout>
mainAcitivity.java
package com.Jason.s01_e05_acitivity;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=(TextView)findViewById(R.id.textView);
textView.setText("Hello Jason");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
2.監聽器:
Eclipse導入一個包之類的使用ctrl+shift+o快捷鍵
package com.Jason.s01_e05_acitivity;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
publicclass MainActivity extends Activity {
private TextView textView;
private Button button;
intcount=0;
@Override
protectedvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=(TextView)findViewById(R.id.textView);
button=(Button)findViewById(R.id.button);
ButtonListener buttonListener=new ButtonListener();
button.setOnClickListener(buttonListener);
}
@Override
publicboolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
returntrue;
}
class ButtonListener implements OnClickListener{
@Override
publicvoid onClick(View v) {
// TODO Auto-generated method stub
count++;
textView.setText(count+"");
}
}
}