自定义设置以触发Shell脚本(Custom Settings to Fire off Shell Script)

 您的类需要实现Preference.OnPreferenceChangedListener接口并设置为ListPreference的更改侦听器。 您的侦听器方法将作为参数传递新值，此时您可以将其传递给execRootCmdSilent方法。 
 
 关键的smali部分位于以下文件的底部： 
 
.method public onPreferenceChange(Landroid/preference/Preference;Ljava/lang/Object;)Z

    move-object v2, p2

    // there are some more moves here and a test, which is why we're shuffling registers

    move-object v3, v2

    invoke-virtual {v3}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v3

    invoke-static {v3}, Lsarbs/com/tinker/SettingsActivity;->execRootCmdSilent(Ljava/lang/String;)I
 
 基本上， p2值是传递给onPreferenceChange方法（ newValue ）的第二个参数。 我们将其移动到本地寄存器中，然后在其上invoke-virtual toString方法。 将该调用的结果移动到v3寄存器中，然后可以使用该v3寄存器作为参数invoke-static execRootCmdSilent方法。 
 
 我用来实现这个的Java代码： 
 
package sarbs.com.tinker;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;

public class SettingsActivity extends PreferenceActivity implements Preference.OnPreferenceChangeListener {
    ListPreference mListPreference;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.pref_general);

        mListPreference = (ListPreference) findPreference("dp_cleaner");
        mListPreference.setOnPreferenceChangeListener(this);
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        if (preference == mListPreference) {
            execRootCmdSilent(newValue.toString());
        }
        return true;
    }

    public static int execRootCmdSilent(String str) {
        return 0;
    }
}
 
 它产生的smali代码： 
 
.class public Lsarbs/com/tinker/SettingsActivity;
.super Landroid/preference/PreferenceActivity;
.source "SettingsActivity.java"

# interfaces
.implements Landroid/preference/Preference$OnPreferenceChangeListener;


# instance fields
.field mListPreference:Landroid/preference/ListPreference;


# direct methods
.method public constructor <init>()V
    .registers 3

    .prologue
    .line 8
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, v0

    invoke-direct {v1}, Landroid/preference/PreferenceActivity;-><init>()V

    return-void
.end method

.method public static execRootCmdSilent(Ljava/lang/String;)I
    .registers 3

    .prologue
    .line 30
    move-object v0, p0

    .local v0, "str":Ljava/lang/String;
    const/4 v1, 0x0

    move v0, v1

    .end local v0    # "str":Ljava/lang/String;
    return v0
.end method


# virtual methods
.method protected onCreate(Landroid/os/Bundle;)V
    .registers 7

    .prologue
    .line 13
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, p1

    .local v1, "savedInstanceState":Landroid/os/Bundle;
    move-object v2, v0

    move-object v3, v1

    invoke-super {v2, v3}, Landroid/preference/PreferenceActivity;->onCreate(Landroid/os/Bundle;)V

    .line 15
    move-object v2, v0

    const v3, 0x7f030001

    invoke-virtual {v2, v3}, Lsarbs/com/tinker/SettingsActivity;->addPreferencesFromResource(I)V

    .line 17
    move-object v2, v0

    move-object v3, v0

    const-string v4, "dp_cleaner"

    invoke-virtual {v3, v4}, Lsarbs/com/tinker/SettingsActivity;->findPreference(Ljava/lang/CharSequence;)Landroid/preference/Preference;

    move-result-object v3

    check-cast v3, Landroid/preference/ListPreference;

    iput-object v3, v2, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    .line 18
    move-object v2, v0

    iget-object v2, v2, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    move-object v3, v0

    invoke-virtual {v2, v3}, Landroid/preference/ListPreference;->setOnPreferenceChangeListener(Landroid/preference/Preference$OnPreferenceChangeListener;)V

    .line 19
    return-void
.end method

.method public onPreferenceChange(Landroid/preference/Preference;Ljava/lang/Object;)Z
    .registers 8

    .prologue
    .line 23
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, p1

    .local v1, "preference":Landroid/preference/Preference;
    move-object v2, p2

    .local v2, "newValue":Ljava/lang/Object;
    move-object v3, v1

    move-object v4, v0

    iget-object v4, v4, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    if-ne v3, v4, :cond_12

    .line 24
    move-object v3, v2

    invoke-virtual {v3}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v3

    invoke-static {v3}, Lsarbs/com/tinker/SettingsActivity;->execRootCmdSilent(Ljava/lang/String;)I

    move-result v3

    .line 26
    :cond_12
    const/4 v3, 0x1

    move v0, v3

    .end local v0    # "this":Lsarbs/com/tinker/SettingsActivity;
    return v0
.end method

Your class needs to implement the Preference.OnPreferenceChangedListener interface and be set as your ListPreference's change listener. Your listener method will be passed the new value as a parameter, at which point you can pass that in to your execRootCmdSilent method.
 
The critical smali section is toward the bottom of the below files:
 
.method public onPreferenceChange(Landroid/preference/Preference;Ljava/lang/Object;)Z

    move-object v2, p2

    // there are some more moves here and a test, which is why we're shuffling registers

    move-object v3, v2

    invoke-virtual {v3}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v3

    invoke-static {v3}, Lsarbs/com/tinker/SettingsActivity;->execRootCmdSilent(Ljava/lang/String;)I
 
Basically, the p2 value is the second parameter being passed to the onPreferenceChange method (newValue). We move that into a local register, and then invoke-virtual the toString method on it. Move the result of that call into the v3 register, and then you can invoke-static your execRootCmdSilent method using that v3 register as the parameter.
 
The Java code I used to implement this:
 
package sarbs.com.tinker;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;

public class SettingsActivity extends PreferenceActivity implements Preference.OnPreferenceChangeListener {
    ListPreference mListPreference;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.pref_general);

        mListPreference = (ListPreference) findPreference("dp_cleaner");
        mListPreference.setOnPreferenceChangeListener(this);
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        if (preference == mListPreference) {
            execRootCmdSilent(newValue.toString());
        }
        return true;
    }

    public static int execRootCmdSilent(String str) {
        return 0;
    }
}
 
And the smali code it produced:
 
.class public Lsarbs/com/tinker/SettingsActivity;
.super Landroid/preference/PreferenceActivity;
.source "SettingsActivity.java"

# interfaces
.implements Landroid/preference/Preference$OnPreferenceChangeListener;


# instance fields
.field mListPreference:Landroid/preference/ListPreference;


# direct methods
.method public constructor <init>()V
    .registers 3

    .prologue
    .line 8
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, v0

    invoke-direct {v1}, Landroid/preference/PreferenceActivity;-><init>()V

    return-void
.end method

.method public static execRootCmdSilent(Ljava/lang/String;)I
    .registers 3

    .prologue
    .line 30
    move-object v0, p0

    .local v0, "str":Ljava/lang/String;
    const/4 v1, 0x0

    move v0, v1

    .end local v0    # "str":Ljava/lang/String;
    return v0
.end method


# virtual methods
.method protected onCreate(Landroid/os/Bundle;)V
    .registers 7

    .prologue
    .line 13
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, p1

    .local v1, "savedInstanceState":Landroid/os/Bundle;
    move-object v2, v0

    move-object v3, v1

    invoke-super {v2, v3}, Landroid/preference/PreferenceActivity;->onCreate(Landroid/os/Bundle;)V

    .line 15
    move-object v2, v0

    const v3, 0x7f030001

    invoke-virtual {v2, v3}, Lsarbs/com/tinker/SettingsActivity;->addPreferencesFromResource(I)V

    .line 17
    move-object v2, v0

    move-object v3, v0

    const-string v4, "dp_cleaner"

    invoke-virtual {v3, v4}, Lsarbs/com/tinker/SettingsActivity;->findPreference(Ljava/lang/CharSequence;)Landroid/preference/Preference;

    move-result-object v3

    check-cast v3, Landroid/preference/ListPreference;

    iput-object v3, v2, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    .line 18
    move-object v2, v0

    iget-object v2, v2, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    move-object v3, v0

    invoke-virtual {v2, v3}, Landroid/preference/ListPreference;->setOnPreferenceChangeListener(Landroid/preference/Preference$OnPreferenceChangeListener;)V

    .line 19
    return-void
.end method

.method public onPreferenceChange(Landroid/preference/Preference;Ljava/lang/Object;)Z
    .registers 8

    .prologue
    .line 23
    move-object v0, p0

    .local v0, "this":Lsarbs/com/tinker/SettingsActivity;
    move-object v1, p1

    .local v1, "preference":Landroid/preference/Preference;
    move-object v2, p2

    .local v2, "newValue":Ljava/lang/Object;
    move-object v3, v1

    move-object v4, v0

    iget-object v4, v4, Lsarbs/com/tinker/SettingsActivity;->mListPreference:Landroid/preference/ListPreference;

    if-ne v3, v4, :cond_12

    .line 24
    move-object v3, v2

    invoke-virtual {v3}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v3

    invoke-static {v3}, Lsarbs/com/tinker/SettingsActivity;->execRootCmdSilent(Ljava/lang/String;)I

    move-result v3

    .line 26
    :cond_12
    const/4 v3, 0x1

    move v0, v3

    .end local v0    # "this":Lsarbs/com/tinker/SettingsActivity;
    return v0
.end method