Android 開啟已安裝的應用程序, ACTION_APPLICATION_DETAILS_SETTINGS, Intent, startActivity, ArrayAdapter, Spinner

EX0624.java

package com.example.administrator.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

/**
 * Created by Administrator on 2014/10/12.
 */
public class EX0624 extends Activity {
    private Button mButton1, mButton2;

    @Override
    public void onCreate(Bundle savedInstatnceState) {
        super.onCreate(savedInstatnceState);
        setContentView(R.layout.ex0624);

        mButton1 = (Button) findViewById(R.id.myButton1);
        mButton2 = (Button) findViewById(R.id.myButton2);

        mButton1.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                /* 開啟設置鬧鐘畫面 */
                Intent intent = new Intent();
                intent.setAction("android.intent.action.SET_ALARM");    // 這句有點問題,待查
                startActivity(intent);
            }
        });

        mButton2.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                /* 開啟settings畫面 */
                Intent intent = new Intent(EX0624.this, EX0624_settings.class);
                startActivity(intent);
            }
        });
    }
}

ex0624.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Alarms"
        android:id="@+id/myButton1" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Manage apps"
        android:id="@+id/myButton2" />
</LinearLayout>

ex0624_setting.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:id="@+id/myTextView" />

    <Spinner
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/mySpinner" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Detail"
        android:id="@+id/myButtonDetail" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open All"
        android:id="@+id/myButtonAll" />
</LinearLayout>

EX0624_settings.java

package com.example.administrator.test;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;


import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2014/10/12.
 */
public class EX0624_settings extends Activity {
    private Button mButtonDetail, mButtonAll;
    private Spinner mSpinner;
    private TextView mTextView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ex0624_setting);

        mButtonDetail = (Button) findViewById(R.id.myButtonDetail);
        mButtonAll = (Button) findViewById(R.id.myButtonAll);
        mSpinner = (Spinner) findViewById(R.id.mySpinner);
        mTextView = (TextView) findViewById(R.id.myTextView);

        /* 取得所有的packageName */
        PackageManager pm = getPackageManager();

        List<PackageInfo> packinfo = pm.getInstalledPackages(PackageManager.GET_ACTIVITIES);
        List<String> packnames = new ArrayList<String>();
        for (int i = 0 ; i< packinfo.size() ; i++) {
            packnames.add(packinfo.get(i).packageName);
        }

        /* 將所有的packageName 放置ArrayAdapter */
        ArrayAdapter adapter = new ArrayAdapter(
                this, android.R.layout.simple_spinner_item, packnames);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mSpinner.setAdapter(adapter);

        mSpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                mTextView.setText(arg0.getSelectedItem().toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                mTextView.setText("");
                Toast.makeText(EX0624_settings.this, "請選擇",Toast.LENGTH_SHORT).show();
            }
        });

        mButtonAll.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                /* 開啟所有程序的畫面 */
                Intent intent = new Intent(Settings.ACTION_MANAGE_ALL_APPLICATIONS_SETTINGS);
                startActivity(intent);
            }
        });

        mButtonDetail.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                String packagename = "" + mTextView.getText();
                if (! packagename.equals("")) {
                    /* 以packagename開啟畫面 */
                    Intent intent = new Intent(
                            Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
                            Uri.parse("package:" + packagename));

                    startActivity(intent);
                }
            }
        });
    }
}

 Intent intent = new Intent(
                        Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
                        Uri.parse("package:" + packagename));

                startActivity(intent);

Thank you!