显示启动activity
这个很简单，下面是代码示例：
为了看着方便，所以就把layout直接截图了，里面的代码只是一些简单的布局。
activity_login.xml:
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" alt="" />
activity_main.xml:
aaarticlea/png;base64,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" alt="" />
下面是Manifest.xml中的代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.bundle01"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" /> <application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".LoginActivity"
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=".MainActivity"
android:label="@string/title_activity_main" >
</activity>
</application> </manifest>
Manifest.xml
LoginActivity.java中的代码：
package com.example.bundle01; import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText; public class LoginActivity extends Activity {
EditText metId,metPwd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView();
setListener();
}
private void setListener() {
setLoginListener();
}
private void setLoginListener() {
findViewById(R.id.btnLogin).setOnClickListener(new OnClickListener() { @Override
public void onClick(View v) {
String id = metId.getText().toString();
String pwd = metPwd.getText().toString(); Intent intent = new Intent(LoginActivity.this,MainActivity.class); intent.putExtra("id", id);
intent.putExtra("pwd", pwd); startActivity(intent);
}
});
}
private void initView() {
metId = (EditText) findViewById(R.id.etName);
metPwd = (EditText) findViewById(R.id.etPassword);
}
}
LoginActivity.java
这个时候的Intent就是显示调用，直接指定了接收参数的Activity，可以唯一确定一个Activity，意图特别明确，这个时候需要在MainActivity接收参数：
MainActivity中的代码：
package com.example.bundle01; import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast; public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); Intent intent = getIntent(); Bundle date = intent.getExtras();
String id = date.getString("id");
String pwd = date.getString("pwd"); Toast.makeText(this, "name = " + id + ", pwd = " + pwd, 4000).show();
Log.i("main", "name = " + id + ", pwd = " + pwd);
}
}
MainActivity.java
另外这个时候传递的参数使用的方法是putExtra，如果传递的参数比较多可以使用Bundle类似于map。
隐式启动activity
原理：当启动另外一个Activity的时候，不是显式的指定activity名字，而是通过action或者category设置条件。比如，要卸载一个apk，就需要启动卸载界面，但是这个是android 系统写好的，相当于执行另外一个程序的activity，我们不知道另外一个程序中的activity的名字
跨程序的activity调用，必须启动隐式意图
在一个activity要实现一个预定义功能，或者在当前activity中不方便实现的功能，就只能调用别的activity来实现
预定义就是调用android系统写好的activity来实现我们想要实现的功能
怎么调用非当前activity或者非当前application的activity的功能呢？
1 找到要调用activity和操作的资源uri:统一资源定位和标示
2 要有操作这个资源的权限：<Manifest><use-permission>
3 要知道资源的数据类型，然后系统会自动调用相关程序来处理：MIME:大数据类型/小数据类型 audio/mp3
下面隐式启动activity
layout：全部都是<Button/>
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" alt="" />
MainActivity.java中代码：
package com.jaovo.day04_06; import java.io.File; import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener; public class MainActivity extends Activity implements OnClickListener { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListener();
} private void setListener() {
findViewById(R.id.btnBrowser).setOnClickListener(this);
findViewById(R.id.btnCall).setOnClickListener(this);
findViewById(R.id.btnDial).setOnClickListener(this);
findViewById(R.id.btnInstall).setOnClickListener(this);
findViewById(R.id.btnPlayMusic).setOnClickListener(this);
findViewById(R.id.btnSendSms).setOnClickListener(this);
findViewById(R.id.btnStartSecondActivity).setOnClickListener(this);
findViewById(R.id.btnUninstall).setOnClickListener(this);
} @Override
public void onClick(View v) {
Intent intent = null;
switch (v.getId()) {
case R.id.btnStartSecondActivity:
intent = new Intent("com.jaovo.day04_06.SecondActivity");
break;
case R.id.btnBrowser:
intent = new Intent(Intent.ACTION_VIEW);
// 这里setData的数据通过Uri定位到一个远程服务器上的php页面资源.
// setData,给intent的mData成员变量赋值,并且,可以自动判定传入数据的数据类型
// 这里就会自动判定,传入的是一个远程的URL地址.
// 所以android系统会自动调用浏览器来访问
intent.setData(Uri.parse("http://www.jaovo.com/index.php"));
break;
case R.id.btnCall: // 需要注册权限,打电话是敏感操作
// mData成员变量,在intent中表示某个资源对象.
// android中资源对象怎么表示和定位:Uri定位和表示一个字符串类型对象的地址
// Uri是一个资源定位符,通过资源定位符找到要操作的对象
intent = new Intent(Intent.ACTION_CALL);// 也有指定类型的意思
// 这是只是告诉intent要匹配什么样子的activity
intent.setData(Uri.parse("tel:10010"));
break;
case R.id.btnDial:
intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:188690"));
break;
case R.id.btnInstall:{
// 4.3之前,外部存储卡是在/mnt,4.4/storeage/sdcard
File dir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS); // 代表内存中一个文件对象
File file = new File(dir, "baidu_safe.apk");
intent = new Intent(Intent.ACTION_VIEW);
// 第二个参数是固定的,说明这是一个android压缩包格式,apk
intent.setDataAndType(Uri.fromFile(file),
"application/vnd.android.package-archive");
}
break; case R.id.btnPlayMusic: //播放音乐
intent = new Intent(Intent.ACTION_VIEW);
File dir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
File file = new File(dir, "xqg.mp3");
intent.setDataAndType(Uri.fromFile(file), "audio/mp3");
break;
case R.id.btnSendSms:
intent = new Intent(Intent.ACTION_SENDTO);
//格式固定不变
intent.setData(Uri.parse("smsto:1245432324"));
intent.putExtra("sms_body", "hello Android");
break;
case R.id.btnUninstall:
intent = new Intent(Intent.ACTION_DELETE);
//只需要包名即可,不需要程序名
intent.setData(Uri.parse("package:"+"com.jaovo.day04_05"));
break; }
startActivity(intent);// 这一句必须得有
}
}
MainActivity.java
Manifest.xml中的代码：
<?xml version="1.0" encoding="utf-8"?> <!--
命名的关键:唯一性.包域名保证唯一性.
在android中,有一个很重要的概念:资源(文件,不光是文件,还可以表示你某个文件当中可调用的内容)
通过一个URL为了表示这些的资源的唯一性,我们通过URL的形式来唯一的表示某一个资源
--> <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jaovo.day04_06"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" /> <uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CALL_PHONE" /> <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=".SecondActivity"
android:label="@string/title_activity_second" >
<intent-filter>
<action android:name="com.jaovo.day04_06.SecondActivity" /> <category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application> </manifest>
Manifest.xml
当点击按钮的时候，系统会自动筛选合适的Activity，从而执行对应的程序。
隐式，即不是像显式的那样直接指定需要调用的Activity，隐式不明确指定启动哪个Activity，而是设置Action、Data、Category，让系统来筛选出合适的Activity。筛选是根据所有的<intent-filter>来筛选。