Android——Activity跳转

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?><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="com.hanqi.text3.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!"        android:id="@+id/textView" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="跳转页面"        android:id="@+id/mybutton"        android:layout_below="@+id/textView"        android:layout_toRightOf="@+id/textView"        android:layout_toEndOf="@+id/textView"        android:layout_marginTop="78dp"        android:onClick="onMyButtonClick"        /></RelativeLayout>

MainActivity.java

package com.hanqi.text3;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.View;//继承了Activitypublic class MainActivity extends Activity {    @Override //覆盖  重写了父类的onCreate()    protected void onCreate(Bundle savedInstanceState) {        //super  父类        //调用了父类的方法        super.onCreate(savedInstanceState);        //设置Java代码和layout文件的关联        //通过R文件的id值        setContentView(R.layout.activity_main);    }    //按钮点击事件的回调函数    public void onMyButtonClick(View v)    {        Log.e("ATG","按钮点击事件触发");       // Activity2 a2= new Activity2();        //先创建意图 Intent        //第一个参数 来源实例， 就是当前Activity实例        //第二个参数 目标类， 目标Activity的class        Intent in = new Intent(this,Activity2.class);        //发动意图        startActivity(in);    }}

需要注意的是这个方法必须符合三个条件：1.public　　2.返回void　　3.只有一个参数View，这个View就是被点击的这个控件。

activity2.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">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="大家好"        />    <EditText        android:layout_width="100dp"        android:layout_height="wrap_content"        android:id="@+id/et"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="跳转下一个"        android:onClick="onbuttonclick"        /></LinearLayout>

Activity2.java

package com.hanqi.text3;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.PersistableBundle;import android.util.Log;import android.view.View;import android.widget.EditText;/** * Created by Administrator on 2016/3/16. *///回调方法public class Activity2 extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //        setContentView(R.layout.activity2);        System.out.println("这是我运行的第一个Activity");    //    Log.d("text", "log输出的信息");  //      Log.w("text", "log输出的信息");  //      Log.e("text", "log输出的信息"); //       Log.i("text","log输出的信息"); //       Log.v("text","log输出的信息");        Log.e("TAG","######创建");    }    @Override   protected void onStart(){       super.onStart();       Log.e("ATG","######启动");    }    @Override    protected void onResume(){        super.onResume();        Log.e("ATG", "######显示");    }    @Override    protected void onPause(){        super.onPause();        Log.e("ATG", "######暂停");    }    @Override    protected void onStop(){        super.onStop();        Log.e("ATG", "######停止");    }    @Override    protected void onRestart(){        super.onRestart();        Log.e("ATG", "######重新启动");    }    //回调方法    //1.在暂停之后和停止之前保存    int i=0;    String etkey ="edittext";//成员变量    EditText et;    @Override    protected void onSaveInstanceState(Bundle outState) {        //Bundle实际是一个Map，可以存储键值对key/value        i++;        Log.e("ATG","保存="+i);        outState.putInt("myKey",i);        super.onSaveInstanceState(outState);        //保存用户的输入信息        //EditText        //使用id查找并获取View的实例         et= (EditText)findViewById(R.id.et);        String str=et.getText().toString();//局部变量        Log.e("TAG","获取用户输入="+str);        outState.getString("edittext",str);    }    //2.恢复销毁前的保持状态    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);       i = savedInstanceState.getInt("myKey");        Log.e("ATG", "获取="+i);        //恢复用户数据        String str = savedInstanceState.getString(etkey);        Log.e("ATG", "获取str="+str);        //设置输入框里面的内容        //操作View的实例        et = (EditText)findViewById(R.id.et);        et.setText(str);    }    @Override    protected void onDestroy(){        super.onDestroy();        Log.e("ATG", "######销毁");    }    public void onbuttonclick(View v)    {        Intent in = new Intent(this,Activity3.class);        startActivity(in);    }}

activity3.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">    <Button        android:layout_width="100dp"        android:layout_height="wrap_content"        android:text="关闭"        android:onClick="onClick"        /></LinearLayout>

Activity3.java

package com.hanqi.text3;import android.app.Activity;import android.os.Bundle;import android.os.PersistableBundle;import android.view.View;/** * Created by Administrator on 2016/3/19. */public class Activity3 extends Activity {    @Override    public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {        super.onCreate(savedInstanceState, persistentState);        setContentView(R.layout.activity3);    }    public void onClick(View v)    {        //关闭        finish();    }}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.hanqi.text3">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".Activity2"            >            <intent-filter>                <action android:name="android.intent.action.VIEW" />                <category android:name="android.intent.category.DEFAULT" />            </intent-filter>        </activity>        <activity android:name=".Activity3"            >            <intent-filter>                <action android:name="android.intent.action.VIEW" />                <category android:name="android.intent.category.DEFAULT" />            </intent-filter>        </activity>        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

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