Android基本组件02（TextView）

//ActivityTextview.javapackage android.ActivityUI;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;public class ActivityTextview extends Activity{public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.textview);setTitle("TextView"); //get TextView objectTextView textview = (TextView)findViewById(R.id.textview);    String string = "Welcome use TextView";    //set text color    textview.setTextColor(Color.RED);    //set text font size    textview.setTextSize(20);    //set background color    textview.setBackgroundColor(Color.BLUE);    //set TextView's display     textview.setText(string);            Button button_change = (Button)findViewById(R.id.button_change);    button_change.setOnClickListener(new Button.OnClickListener(){    public void onClick(View v){    TextView text_view = (TextView)findViewById(R.id.textview);    CharSequence text_view_old = text_view.getText();    text_view.setText(text_view_old+"add:I am happy");    }    }); }}//textview.xml<?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"><TextView android:text="TextView" android:id="@+id/textview" android:layout_width="fill_parent"android:layout_height="wrap_content"></TextView><Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/button_change" android:text="Change"></Button></LinearLayout>

 

 

点击Change按钮后：