屏幕使用一個活動來實現，屏幕間是相互獨立的，屏幕之間的跳轉關系通過Intent來實現。
屏幕間跳轉分為以下幾類：
1. 屏幕1直接跳轉到屏幕2
Intent intent = new Intent();
intent.setClass(屏幕1活動名.this,屏幕2活動名.class);
startActivity(intent);
finish(); //結束當前活動
2. 屏幕1帶參數跳轉到屏幕2
使用Bundle來傳參數。
例子：猜拳游戲
界面：
重要代碼：
電腦的選擇是隨機的，本次聯系的基本思路是，三個選項利用三個數字來代替，讓電腦 隨機生成一個數字，根據數字的不同來產生不同的結果。
switch (radioGroup.getCheckedRadioButtonId()){
case R.id.stone:
player = 0;
break;
case R.id.scissors:
player = 1;
break;
case R.id.textile:
player = 2;
break;
default:
Toast.makeText(MainActivity.this, "請選擇", Toast.LENGTH_LONG).show();
break;
}
skip();
}
//頁面跳轉
private void skip(){
Intent intent = new Intent();
intent.setClass(MainActivity.this, ResultMainActivity.class);
Bundle bundle = new Bundle();
bundle.putInt("player", player);
bundle.putInt("computer", new Random().nextInt(3));
intent.putExtra("result", bundle);
startActivity(intent);
}
跳轉之后，要接受參數：
int playerInt = bundle.getInt("player");
int computerInt = bundle.getInt("computer");
猜拳游戲完整代碼：
activity_first.xml代碼
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="請選擇您要出的拳:"
android:textSize="20dip" />
<RadioGroup
android:id="@+id/quans"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:id="@+id/shitou"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="石頭"
android:textSize="20dip" />
<RadioButton
android:id="@+id/jiandao"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dip"
android:text="剪刀" />
<RadioButton
android:id="@+id/bu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dip"
android:text="布" />
</RadioGroup>
<Button
android:id="@+id/chuquan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dip"
android:text="出拳" />
</LinearLayout>
activity_second.xml代碼
<TextView
android:id ="@+id/show"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dip"
android:text="@string/hello_world" />
</LinearLayout>
firstActivity.java代碼
import java.util.Random;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
public class firstActivity extends Activity {
private Button chuquan;
private RadioGroup quans;
private int player;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
setTitle("猜拳游戲");
chuquan = (Button)findViewById(R.id.chuquan);
chuquan.setOnClickListener(mChuQuanListener);
quans = (RadioGroup)findViewById(R.id.quans);
}
private OnClickListener mChuQuanListener = new OnClickListener()
{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch(quans.getCheckedRadioButtonId())
{
case R.id.shitou:
player = 0;
break;
case R.id.jiandao:
player = 1;
break;
case R.id.bu:
player = 2;
break;
default:
Toast.makeText(firstActivity.this, "請選擇", Toast.LENGTH_LONG).show();
break;
}
//將的到的值傳給secondActivity
skip();
}
};
private void skip()
{
Intent intent = new Intent();
intent.setClass(firstActivity.this, secondActivity.class);
Bundle bundle = new Bundle();
bundle.putInt("player", player);
bundle.putInt("computer", new Random().nextInt(3));
intent.putExtra("result", bundle);
startActivity(intent);
}
}
secondActivity.java代碼
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
public class secondActivity extends Activity {
private TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
setTitle("結果");
tv = (TextView)findViewById(R.id.show);
Bundle bundle = this.getIntent().getBundleExtra("result");
int playerInt = bundle.getInt("player");
int computerInt = bundle.getInt("computer");
tv.setText("猜拳結果/n");
tv.append("您的選擇：");
intChangeString(playerInt);
tv.append("電腦的選擇：");
intChangeString(computerInt);
tv.append("結果：");
if(playerInt == 0)
{
if(computerInt == 0)
{
tv.append("平局");
}
else if(computerInt == 1)
{
tv.append("您是贏家");
}
else
{
tv.append("電腦是贏家");
}
}
else if(playerInt == 1)
{
if(computerInt == 0)
{
tv.append("電腦是贏家");
}
else if(computerInt == 1)
{
tv.append("平局");
}
else
{
tv.append("您是贏家");
}
}
else
{
if(computerInt == 0)
{
tv.append("您是贏家");
}
else if(computerInt == 1)
{
tv.append("電腦是贏家");
}
else
{
tv.append("平局");
}
}
}
private void intChangeString(int n)
{
switch (n)
{
case 0:
tv.append("石頭/n");
break;
case 1:
tv.append("剪刀/n");
break;
case 2:
tv.append("布/n");
break;
default:
Toast.makeText(secondActivity.this, "錯誤", Toast.LENGTH_LONG).show();
break;
}
}
}
3. 屏幕1跳轉到屏幕2，屏幕2執行結束后有返回值到屏幕1（帶返回值跳轉）
參考示例程序：ReceiveResult（ApiDemo => App=>Activity=>ReceiveResult）
重要代碼：
//屏幕1調轉到屏幕2
Intent intent = new Intent(Forward.this,ForwardTargetActivity.class);
startActivityForResult(intent, GET_CODE);
//在屏幕2設置返回值
setResult(RESULT_OK,(new Intent()).setAction("Violet!"));
finish();
//在屏幕1得到從屏幕2返回的內容
@Override
protected void onActivityResult(int RequestCode,int ResultCode,Intent data)
{
if(RequestCode == GET_CODE)
{
if(ResultCode == RESULT_CANCELED)
{
edit.append("canceled!");
}
else
{
edit.append("(okay ");
edit.append(Integer.toString(ResultCode));
edit.append(")");
}
if(data!=null)
{
edit.append(data.getAction());
}
}
edit.append("/n");
}
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