Android 建立一個activity 及建立Intent物件跳轉介面並傳值
阿新 • • 發佈：2019-02-18
一、建立一個activity
步驟1、建立一個java類，該類必須繼承Android.app.Activity
步驟2、重寫該類的onCreate(Bundle)方法
步驟3、建立一個佈局檔案res/layout
步驟4、在onCreate方法中呼叫setContentView(佈局檔案)，繫結佈局
步驟5、在Androidmainifest.xml檔案中註冊新的窗體類
步驟6、進行窗體開發。
二、建立Intent跳轉物件並傳值
1、①new Intent(原介面，目標介面)
Intent intent=new Intent(MainActivity.this,ResultActivity.class);
② Intent intent = new Intent();
intent.setClass(原介面，目標介面);
2、Intent物件傳值
intent.putExtra("user",user);
3、跳轉
startActivity(intent);
4、另一個Activity獲取傳入的值
Intent intent=getIntent();
int user=intent.getIntExtra("user", -1); //int型的 若傳過來的值為空則給賦值-1
三、自定義對話方塊
<activity
android:name=".ResultActivity"
android:label="結果"
android:theme="@android:style/Theme.Dialog" >
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
MainActivity.java
ResultActivity.javapackage com.example.demo3_guss; import java.util.Random; import android.R.integer; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.widget.SimpleCursorAdapter.ViewBinder; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.RadioButton; import android.widget.Toast; public class MainActivity extends Activity { private RadioButton rdoJD, rdoST, rdoB; private Button btn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); this.rdoJD = (RadioButton) findViewById(R.id.rdoJD); this.rdoST = (RadioButton) findViewById(R.id.rdoST); this.rdoB = (RadioButton) findViewById(R.id.rdoB); this.btn = (Button) findViewById(R.id.btn); this.btn.setOnClickListener(new Viewocl()); } private class Viewocl implements View.OnClickListener { @Override public void onClick(View arg0) { // TODO Auto-generated method stub switch (arg0.getId()) { case R.id.btn: int user = 0; if (rdoJD.isChecked()) { // Toast.makeText(MainActivity.this, // "你選中了剪刀！",Toast.LENGTH_SHORT).show(); user = 1; } else if (rdoST.isChecked()) { // Toast.makeText(MainActivity.this, // "你選中了石頭！",Toast.LENGTH_SHORT).show(); user = 2; } else { // Toast.makeText(MainActivity.this, "你選中了布！", // Toast.LENGTH_SHORT).show(); user = 3; } Intent intent=new Intent(); intent.setClass(MainActivity.this, ResultActivity.class); intent.putExtra("user", user); startActivity(intent); break; default: break; } } } }
package com.example.demo3_guss;
import java.util.Random;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class ResultActivity extends Activity {
private TextView txtShow;
private Button btnClose;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
this.txtShow=(TextView) findViewById(R.id.txtShow);
this.btnClose=(Button) findViewById(R.id.btnClose);
this.btnClose.setOnClickListener(new Viewocl());
Intent intent = getIntent();
int user = intent.getIntExtra("user", -1);
int cpu = new Random().nextInt(3) + 1;
String message="";
if (user == 3 && cpu == 1) {
message="使用者：" + convert(user) + " VS " + convert(cpu)
+ "電腦\n對不起，輸了！";
// Toast.makeText(
// ResultActivity.this,
// "使用者：" + convert(user) + " VS " + convert(cpu)
// + "電腦\n對不起，輸了！", Toast.LENGTH_SHORT).show();
} else if (user > cpu) {
message="使用者：" + convert(user) + " VS " + convert(cpu)
+ "電腦\n恭喜你，贏了！";
// Toast.makeText(
// ResultActivity.this,
// "使用者：" + convert(user) + " VS " + convert(cpu)
// + "電腦\n恭喜你，贏了！", Toast.LENGTH_SHORT).show();
} else if (user < cpu) {
message="使用者：" + convert(user) + " VS " + convert(cpu)
+ "電腦\n對不起，輸了！";
// Toast.makeText(
// ResultActivity.this,
// "使用者：" + convert(user) + " VS " + convert(cpu)
// + "電腦\n對不起，輸了！", Toast.LENGTH_SHORT).show();
} else if (user == 1 && cpu == 3) {
message="使用者：" + convert(user) + " VS " + convert(cpu)
+ "電腦\n恭喜你，贏了！";
// Toast.makeText(
// ResultActivity.this,
// "使用者：" + convert(user) + " VS " + convert(cpu)
// + "電腦\n恭喜你，贏了！", Toast.LENGTH_SHORT).show();
} else {
message="使用者：" + convert(user) + " VS " + convert(cpu)
+ "電腦\n平局！";
// Toast.makeText(
// ResultActivity.this,
// "使用者：" + convert(user) + " VS " + convert(cpu)
// + "電腦\n平局！", Toast.LENGTH_SHORT).show();
}
this.txtShow.setText(message);
}
public String convert(int num) {
String result = "";
switch (num) {
case 1:
result = "剪刀";
break;
case 2:
result = "石頭";
break;
case 3:
result = "布";
break;
default:
break;
}
return result;
}
public class Viewocl implements View.OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.btnClose:
finish();
break;
default:
break;
}
}
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="請您出拳" />
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RadioButton
android:id="@+id/rdoJD"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:checked="true"
android:text="剪刀"
android:textSize="18dp" />
<RadioButton
android:id="@+id/rdoST"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="石頭"
android:textSize="18dp" />
<RadioButton
android:id="@+id/rdoB"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="布"
android:textSize="18dp" />
</RadioGroup>
<Button
android:id="@+id/btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="出拳"
android:textSize="18dp"
></Button>
</LinearLayout>activity_result.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtShow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16dp"
/>
<Button
android:id="@+id/btnClose"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="確定"
/>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.demo3_guss"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="19"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ResultActivity"
android:label="結果"
android:theme="@android:style/Theme.Dialog">
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
</manifest>