Android 幾種屏幕間跳轉的跳轉Intent Bundle

屏幕使用一個活動來實現，屏幕間是相互獨立的，屏幕之間的跳轉關係通過Intent來實現。

屏幕間跳轉分爲以下幾類：

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：猜拳遊戲

界面：

重要代碼：

電腦的選擇是隨機的，本次聯繫的基本思路是，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。

public void onClick(View v) {

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);

}

跳轉之後，要接受參數：

Bundle bundle = this.getIntent().getBundleExtra("result");

int playerInt = bundle.getInt("player");

int computerInt = bundle.getInt("computer");

猜拳遊戲完整代碼：

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1	activity_first.xml代碼

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<linearlayout xmlns: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"> <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"> </radiobutton></radiobutton></radiobutton></radiogroup> <button android:id="@+id/chuquan"android:layout_width="match_parent"android:layout_height="wrap_content"android:textsize="20dip"android:text="出拳"> activity_second.xml代碼</button></textview></linearlayout>

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<linearlayout xmlns: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"> <textview android:id="@+id/show"android:layout_width="match_parent"android:layout_height="wrap_content"android:textsize="20dip"android:text="@string/hello_world"> </textview></linearlayout> firstActivity.java代碼 packagecom.example.caiquangame; importjava.util.Random; importandroid.os.Bundle; importandroid.app.Activity; importandroid.content.Intent; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.RadioGroup; importandroid.widget.Toast; importandroid.support.v4.app.NavUtils; publicclassfirstActivity extendsActivity { privateButton chuquan; privateRadioGroup quans; privateintplayer; @Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_first); setTitle("猜拳遊戲"); chuquan = (Button)findViewById(R.id.chuquan); chuquan.setOnClickListener(mChuQuanListener); quans = (RadioGroup)findViewById(R.id.quans); } privateOnClickListener mChuQuanListener = newOnClickListener() { @Override publicvoidonClick(View arg0) { // TODO Auto-generated method stub switch(quans.getCheckedRadioButtonId()) { caseR.id.shitou: player = 0; break; caseR.id.jiandao: player = 1; break; caseR.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(); } }; privatevoidskip() { Intent intent = newIntent(); intent.setClass(firstActivity.this, secondActivity.class); Bundle bundle = newBundle(); bundle.putInt("player", player); bundle.putInt("computer", newRandom().nextInt(3)); intent.putExtra("result", bundle); startActivity(intent); } }

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1	secondActivity.java代碼

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packagecom.example.caiquangame; importandroid.os.Bundle; importandroid.app.Activity; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.widget.TextView; importandroid.widget.Toast; importandroid.support.v4.app.NavUtils; publicclasssecondActivity extendsActivity { privateTextView tv; @Override publicvoidonCreate(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"); intplayerInt = bundle.getInt("player"); intcomputerInt = 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"); } elseif(computerInt == 1) { tv.append("您是贏家"); } else { tv.append("電腦是贏家"); } } elseif(playerInt == 1) { if(computerInt == 0) { tv.append("電腦是贏家"); } elseif(computerInt == 1) { tv.append("平局"); } else { tv.append("您是贏家"); } } else { if(computerInt == 0)   { tv.append("您是贏家"); } elseif(computerInt == 1) { tv.append("電腦是贏家"); } else { tv.append("平局"); } } } privatevoidintChangeString(intn) { switch(n) { case0: tv.append("石頭\n"); break; case1: tv.append("剪刀\n"); break; case2: 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執行結束後有返回值到屏幕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");

}