第七周作业
1.三个界面,界面1点击按钮使用显式意图开启界面2.
界面2点击按钮隐式意图开启界面3
2.在界面1做一个按钮开启浏览器访问百度
package com.example.app6; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class Activity3 extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity3); } }
package com.example.lj; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.util.Log; import android.view.Menu; import android.view.View; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.e("MainActivity", "调用oncreate");//在logcat里输出,标签为MainActivity,提示信息为调用oncreate } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); Log.e("MainActivity", "调用onstart"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.e("MainActivity", "调用onresume"); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.e("MainActivity", "调用onpause"); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); Log.e("MainActivity", "调用onstop"); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.e("MainActivity", "调用ondestroy"); } @Override protected void onRestart() { // TODO Auto-generated method stub super.onRestart(); Log.e("MainActivity", "调用onRestart"); } //使用显式意图开启界面2(一般同一个应用程序 用显式意图) public void click1(View view){ Intent intent=new Intent(this,SecondActivity.class); startActivity(intent); } //使用隐式意图开启界面2(不同应用程序,用隐式意图,例如开启浏览器、手机照相机等) public void click2(View view){ Intent intent=new Intent(); intent.setAction("com.gd.activity2"); intent.addCategory("android.intent.category.DEFAULT"); startActivity(intent); } public void click3(View view){ Intent intent=new Intent(); intent.setAction("android.intent.action.VIEW"); intent.setData(Uri.parse("http://www.baidu.com")); startActivity(intent); } public void click4(View view){ Intent intent=new Intent(); intent.setAction("android.intent.action.VIEW"); intent.setData(Uri.parse("tel:123456")); startActivity(intent); } public void click5(View view){ Intent intent=new Intent(); intent.setAction("android.media.action.IMAGE_CAPTURE"); intent.addCategory("android.intent.category.DEFAULT"); startActivity(intent); } }
package com.example.lj; import android.app.Activity; import android.os.Bundle; public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); } }
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Activity2" > <Button android:id="@+id/bt2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开启界面三" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.app6" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.app6.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="com.example.app6.Activity2" android:label="@string/title_activity_activity2" > </activity> <activity android:name="com.example.app6.Activity3" android:label="@string/title_activity_activity3" > <intent-filter> <action android:name="com.lrp.start" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> </application> </manifest>