【Android学习笔记】 Intent（5）之隐式Intent (implicit Intent)

效果图

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1. 成员变量

private EditText mWebsiteEditText;

2. 发现，分配

mWebsiteEditText = findViewById(R.id.website_edittext);

3. Intent 部分

    public void openWebsite(View view) {
       // Get the URL text.
       String url = mWebsiteEditText.getText().toString();
    
       // Parse the URI and create the intent.
       Uri webpage = Uri.parse(url);
       Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
    
       // Find an activity to hand the intent and start that activity.
       if (intent.resolveActivity(getPackageManager()) != null) {
           startActivity(intent);
       } else {
           Log.d("ImplicitIntents", "Can't handle this intent!");
       }
    }

定位

public void openLocation(View view) {
   // Get the string indicating a location. Input is not validated; it is
   // passed to the location handler intact.
   String loc = mLocationEditText.getText().toString();

   // Parse the location and create the intent.
   Uri addressUri = Uri.parse("geo:0,0?q=" + loc);
   Intent intent = new Intent(Intent.ACTION_VIEW, addressUri);

   // Find an activity to handle the intent, and start that activity.
   if (intent.resolveActivity(getPackageManager()) != null) {
       startActivity(intent);
   } else {
       Log.d("ImplicitIntents", "Can't handle this intent!");
   }
}

分享

此处调用了ShareCompat 方法

public void shareText(View view) {
        String txt = mShareTextEditText.getText().toString();
        String mimeType = "text/plain";
        ShareCompat.IntentBuilder
                        .from(this)
                        .setType(mimeType)
                        .setChooserTitle(R.string.share_text_with)
                        .setText(txt)
                        .startChooser();
}

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补充：完整code

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mainactivity.java

package com.example.a1104.implicitintents;

import android.content.Intent;
import android.net.Uri;
import android.support.v4.app.ShareCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    private EditText mWebsiteEditText;
    private EditText mLocationEditText;
    private EditText mShareTextEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWebsiteEditText = (EditText) findViewById(R.id.website_edittext);
        mLocationEditText = (EditText) findViewById(R.id.location_edittext);
        mShareTextEditText =  (EditText)findViewById(R.id.share_edittext);
    }

    public void openWebsite(View view) {
        String url = mWebsiteEditText.getText().toString();
        Uri webpage = Uri.parse(url);
        Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
        if (intent.resolveActivity(getPackageManager())!=null){
            startActivity(intent);

        }else {
            Log.d("ImplicitIntents","Can't handle this intent!");
        }

    }

    public void openLocation(View view) {
        String loc = mLocationEditText.getText().toString();
        Uri addressUri = Uri.parse("geo:0,0?q=" + loc);
        Intent intent = new Intent(Intent.ACTION_VIEW, addressUri);
        if (intent.resolveActivity(getPackageManager())!=null){
            startActivity(intent);
        }else {
            Log.d("ImplicitIntents","Can't handle this intent!");
        }
    }

    public void shareText(View view) {
        String txt = mShareTextEditText.getText().toString();
        String mimeType = "text/plain";
        ShareCompat.IntentBuilder
                .from(this)
                .setType(mimeType)
                .setChooserTitle(R.string.share_text_with)
                .setText(txt)
                .startChooser();
    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/website_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/edittext_uri" />
    <Button
        android:id="@+id/open_website_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="24dp"
        android:text="@string/button_uri"
        android:onClick="openWebsite"/>
    <EditText
        android:id="@+id/location_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/edittext_loc" />
    <Button
        android:id="@+id/open_location_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="24dp"
        android:text="@string/button_loc"
        android:onClick="openLocation"/>
    <EditText
        android:id="@+id/share_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/edittext_share"/>
    <Button
        android:id="@+id/share_text_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="24dp"
        android:text="@string/button_share"
        android:onClick="shareText"/>
</LinearLayout>

String

<resources>
    <string name="app_name">Implicit Intents</string>
    <string name="edittext_uri">http://developer.android.com</string>
    <string name="button_uri">Open Website</string>
    <string name="edittext_loc">Golden Gate Bridge</string>
    <string name="button_loc">Open Location</string>
    <string name="edittext_share">\'Twas brillig and the slithy toves</string>
    <string name="button_share">Share This Text</string>
    <string name="share_text_with">Share this text with:</string>
</resources>