一个随机数生成器，在首页不断变化，可以设置范围。
random.java
package zhang.random;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class random extends Activity{
protected void onResume() {
super.onResume();
}
private Button start;
private Button stop;
private TextView show;
private Handler handler;
private Runnable update;
private int i;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.random_main);
//layout file
start=(Button)findViewById(R.id.start);
stop=(Button)findViewById(R.id.stop);
show=(TextView)findViewById(R.id.show);
handler =new Handler();
update = new Runnable(){
public void run(){
Intent intent= getIntent();
int value = intent.getIntExtra("max", 100);
i = Integer.valueOf((int) (Math.random()*value));//获得一个<a title="随机数" href="http://www.android-study.com/jichuzhishi/84.html">随机数</a>
if(value <= 10) {
show.setTextSize(280); // 1
}
else if (value > 10 && value <= 100) {
show.setTextSize(200);//2
}
else if (value > 100 && value <= 1000) {
show.setTextSize(170);//3
}
else if (value > 1000 && value <= 10000) {
show.setTextSize(145);
}
else {
show.setTextSize(60);
}
show.setText(i+"");
handler.postDelayed(update, 3);
}
};
start.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
handler.post(update);
start.setEnabled(false);
}
});
stop.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
handler.removeCallbacks(update);
start.setEnabled(true);
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 1, 1,R.string.set);//add menu-set
menu.add(0, 2, 2,R.string.about);//add menu-about
menu.add(0,3,3,R.string.exit);//add menu-exit
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == 3) {//OnClick set
finish();
}
else if (item.getItemId() == 2) {//OnClick about
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("About").setMessage(R.string.anthor).show();
}
else{//onClick exit
Intent intent = new Intent();
intent.setClass(random.this,setMax.class);
random.this.startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
}
设置范围的Activity
package zhang.random;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class setMax extends Activity{
private EditText getMax;
private Button ok;
private Button cancle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.max);
getMax = (EditText)findViewById(R.id.set);
ok = (Button)findViewById(R.id.okButton);
cancle = (Button)findViewById(R.id.cancleButton);
ok.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
int max = Integer.valueOf(getMax.getText().toString());
Intent intent = new Intent();
intent.putExtra("max",max);
intent.setClass(setMax.this, random.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
setMax.this.startActivity(intent);
setMax.this.finish();
}
});
cancle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent2 = new Intent();
setMax.this.setResult(RESULT_OK, intent2);
setMax.this.finish();
}
});
}
}
主页布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/textView"/>
<EditText
android:id="@+id/set"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxLength="9"
android:inputType="numberSigned"
/>
<Button
android:id="@+id/okButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/ok"
/>
<Button
android:id="@+id/cancleButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/cancle"
/>
</LinearLayout>
设置布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:orientation="vertical"
>
<TextView
android:gravity="center"
android:id="@+id/show"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="@string/hello"
android:textcolor="@color/white"
android:textsize="200dip"
android:textstyle="bold"
/>
<LinearLayout
android:gravity="center"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="horizontal"
>
<Button
android:gravity="bottom"
android:id="@+id/start"
android:layout_height="60dip"
android:layout_width="100dip"
android:text="Start"
android:textsize="35dip"
type="submit"
/>
<Button
android:gravity="bottom"
android:id="@+id/stop"
android:layout_height="60dip"
android:layout_width="100dip"
android:text="Stop"
android:textsize="38dip"
type="submit"
/>
</LinearLayout>
</LinearLayout>
String.xml
<Resources>
<string name="hello">00</string>
<string name="app_name">Random</string>
<string name="exit">退出</string>
<string name="about">关于</string>
<color name="white">#ffffff</color>
<string name="set">设置</string>
<string name="textView">输入最大值:</string>
<string name="ok">确定</string>
<string name="cancle">返回</string>
<string name="anthor">By：没落凄凉\nQQ：270615838</string>
</Resources>
