android入门之intent示例

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从一个界面跳转到另一个界面，把一个界面的信息传送给另一个界面，就需要用到我们的intent方法，接下来带领大家做一个小示例。

配置信息

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.zlg.text2">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".Activity_toast_image" />        <activity android:name=".FrameActivity" />        <activity android:name=".myviewActivity" />        <activity android:name=".LifeActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />                <data android:scheme="http" />            </intent-filter>        </activity>        <activity android:name=".IntentActivity">            <intent-filter>                <action android:name="zlgapp" />                <category android:name="android.intent.category.DEFAULT" />                <data                    android:host="qlu.com"                    android:path="/android"                    android:scheme="ftp" />            </intent-filter>        </activity>        <activity android:name=".subActivity" />        <receiver            android:name=".MyReceiver"            android:enabled="true"            android:exported="true">            <intent-filter>              <action android:name="broadcast.com"></action>            </intent-filter>        </receiver>    </application></manifest>

首先创建一个MainActivity，还覆盖了他的所有方法，以观察他的生命周期，携带信息。

package com.example.zlg.text2;//快捷键ctrl+o覆盖类import android.content.Intent;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.Toast;public class LifeActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout_life);        Log.d(LifeActivity.class.toString(),"onCreate");        Button button=(Button)findViewById(R.id.life_button);    }    @Override    protected void onStart() {        super.onStart();        Log.d(LifeActivity.class.toString(),"onStart");    }    @Override    protected void onResume() {        super.onResume();        Log.d(LifeActivity.class.toString(),"onResume");    }    @Override    protected void onRestart() {        super.onRestart();        Log.d(LifeActivity.class.toString(),"onRestart");    }    @Override    protected void onPause() {        super.onPause();        Log.d(LifeActivity.class.toString(),"onPause");    }    @Override    protected void onStop() {        super.onStop();        Log.d(LifeActivity.class.toString(),"onStop");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.d(LifeActivity.class.toString(),"onDestroy");    }    public void switchAct(View v)    {        Intent intent=new Intent(this,IntentActivity.class);        intent.putExtra("key","你好");        startActivity(intent);    }    public void impStart(View v)    {        Intent intent=new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.baidu.com"));        startActivity(intent);    }    public void impStart2(View v)    {        Intent intent=new Intent("zlgapp", Uri.parse("ftp://qlu.com/android"));        startActivity(intent);    }    public void sendBroadcast(View v)    {        Intent intent=new Intent("broadcast.com");        intent.putExtra("msg","message");        sendBroadcast(intent);    }    public void startSub(View v)    {        Intent intent=new Intent(this,subActivity.class);        startActivityForResult(intent,1);    }    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if(requestCode==1)        {            if(resultCode==RESULT_OK){                Toast.makeText(this, "数据为"+data.getStringExtra("msg"), Toast.LENGTH_SHORT).show();            }            else            {                Toast.makeText(this, "已经取消", Toast.LENGTH_SHORT).show();            }        }    }}//onCreate onStart onResume打开Activity//onPause onStop 切换到别的程序// onRestart onStart onResume//切换回来//onPause onStop onDestroy//退出程序

创建一个layout_main.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"><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="显式跳传跳转到intentActivity"    android:id="@+id/life_button"    android:onClick="switchAct"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/life_button2"        android:onClick="impStart"        android:text="隐式跳传跳转到百度首页"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/life_button3"        android:onClick="impStart2"        android:text="隐式跳传跳转过滤intentActivity"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="获取subActivity的返回值跳转到lifeActivity"        android:onClick="startSub"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="发送广播BroadcastReceiver"        android:onClick="sendBroadcast"        /></LinearLayout>

跳转到的IntentActivity，接收信息。

package com.example.zlg.text2;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView;public class IntentActivity extends AppCompatActivity {  @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout_intent);        Intent intent=getIntent();        String str=intent.getStringExtra("key");        TextView textView=(TextView)findViewById(R.id.intent_tv);        textView.setText(str);    }}

其layout_intent.xml如下

<?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:id="@+id/intent_tv"/></LinearLayout>

跳转后

然后创建一个subActivity

package com.example.zlg.text2;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class subActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout_sub);        Button button1=(Button)findViewById(R.id.but1);        Button button2=(Button)findViewById(R.id.but2);    }    public void OK(View v)    {        String str=((EditText)findViewById(R.id.ed)).getText().toString();        Intent result = new Intent();        result.putExtra("msg",str);        setResult(RESULT_OK, result);        finish();    }    public void NO(View v)    {         finish();    }}

其layout_sub.xml为

<?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">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/ed"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/but1"        android:onClick="OK"        android:text="确认"></Button>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/but2"        android:text="取消"        android:onClick="NO"/></LinearLayout>

在创建一个 MyReceiver 的广播

package com.example.zlg.text2;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        // TODO: This method is called when the BroadcastReceiver is receiving        // an Intent broadcast.        Toast.makeText(context, "广播已发送，信息为："+intent.getStringExtra("msg"), Toast.LENGTH_SHORT).show();    }}

[资源下载地址](http://download.csdn.net/download/u011637078/10050880)
有了这个小示例，我们就可以借此发挥我们的想象了！

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